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Learn how to use if statements in Python. Try practice tasks and learn through text and images. Perfect for students learning GCSE Computer Science in UK schools. top Python 4a - If Statements If Statements Selection is one of three constructs of programming , along with Sequence (logical order) and Iteration (loops). An if statement is a conditional statement that performs a specific action based on conditional values. Essentially, if thing A is true , then thing B will happen . If the user answers yes to the window question, then an appropriate statement is printed. Double equals stands for ‘is equal to ‘. The colon stands for THEN and the line after an if statement must be indented (press tab key once). answer = input ( "Is the window open? " ) if answer == "yes" : print ( "It's chilly in here!" ) Is the window open? yes It's chilly in here! But what if the window is not open? At the moment nothing will happen if you type no: Is the window open? no The elif command stands for else if . Essentially: If thing A is true then do thing B, else if thing C is true then do thing D: But what about any other answer than yes or no? The else command will submit a response if the value is anything else. The if and elif commands have a colon at the end, but else has it at the start. Also, else does not need to be on a new line. answer = input ( "Is the window open? " ) if answer == "yes" : print ( "It's chilly in here!" ) elif answer == "no" : print ( "It's quite hot in here!" ) answer = input ( "Is the window open? " ) if answer == "yes" : print ( "It's chilly in here!" ) elif answer == "no" : print ( "It's quite hot in here!" ) else : print ( "I'm not sure what you mean." ) Is the window open? no It's quite hot in here! Is the window open? banana I'm not sure what you mean. If Statements Task 1 ( Left or Right?) Use an input line to ask the user whether they want to turn left or right . Print a sentence of your choice if they chose left and a different sentence if they chose right . Include an else statement in case the user doesn't input left or right. Example solutions: There is a path ahead. Do you turn left or right? left The path turns and twists until it reaches a cliff. Dead end! There is a path ahead. Do you turn left or right? right A snake slithers across the path and bites your leg. Oh no! There is a path ahead. Do you turn left or right? backwards That's not an option! Nested If Statements Complex programs may require you to have if statements within if statements - when programming, one thing inside another is known as nesting . You must make sure that the related if , elif and else statements line up with each other . Use the tab key to indent a line. outer if inner if weather = input ( "What is the weather like today? " ) if weather == "sunny" : sunny = input ( "How hot is it? " ) if sunny == "very hot" : print ( "Take some sunglasses with you!" ) elif sunny == "cool" : print ( "Maybe take a jacket just in case?" ) else : print ( "Enjoy the sunshine!" ) elif weather == "rainy" : print ( "Take an umbrella!" ) else : print ( "Have a good day!" ) = What is the weather like today? rainy Take an umbrella! = What is the weather like today? sunny How hot is it? cool Maybe take a jacket just in case? = What is the weather like today? snowy Have a good day! = What is the weather like today? sunny How hot is it? very hot Take some sunglasses with you! If Statements Task 2 ( Nested Ifs) Use the weather program above as an example to help you write your own program with a nested if for at least one option. Be careful to have your nested if's if, elif and else statements in line with each other. Your program doesn't have to be about juice. Example solutions: Would you like orange, apple or tomato juice? orange Would you like your orange juice smooth or with bits? smooth One smooth orange juice coming up! Would you like orange, apple or tomato juice? orange Would you like your orange juice smooth or with bits? bits A pulpy orange juice is on its way! Would you like orange, apple or tomato juice? tomato Yuck, you can't be serious? Using Selection with Numbers Comparison operators such as > (greater than ) > = (greater than or equal to ) < (less than ) and < = (less than or equal to ) can be used with if statements. Logical operators such as and and or can also be used - more about them in section 4c . When comparing a variable's value to a specific number, such as 50, don't forget to use double equals ( == ) . Python Comparison Operators score = int ( input ( "Enter the maths test score: " )) if score == 50: print ( "You scored top marks!" ) elif score >= 40 and score < 50: print ( "You scored a great grade!" ) elif score >= 20 and score < 40: print ( "You did okay in the test." ) else : print ( "You have to try harder next time!" ) = Enter the maths test score: 50 You scored top marks! = Enter the maths test score: 43 You scored a great grade! = Enter the maths test score: 20 You did okay in the test. = Enter the maths test score: 13 You have to try harder next time! If Statements Task 3 ( Fastest lap) A racing video game has a challenging track that players try to get a quick lap on. The current fastest lap time is 37 seconds . Ask the player to enter their lap time and print a response based on their input . You need individual responses for the following inputs: Faster than 37 seconds. Between 37 seconds and 59 seconds. Between 60 seconds and 90 seconds. Slower than 90 seconds. Example solutions: Enter your lap time: 35 You have set a new record!!! Enter your lap time: 59 You did well this time! Enter your lap time: 83 A little bit slow this time! Enter your lap time: 110 Were you even trying!?! Hurry up! Not Equal To The opposite of equal to ( == ) is not equal to ( != ). != is often used with while loops to repeat code while an input is not what is expected , for example repeatedly asking for a password while the input is not equal to "fluffythecat123". The code below uses != for an incorrect answer (although it could easily be re-written to use == for a correct answer). answer = input ( "What is the capital of Eritrea? " ) if answer != "Asmara" : print ( "That is incorrect! It is Asmara." ) else : print ( "You got it right!" ) = What is the capital of Eritrea? Asmara You got it right! = What is the capital of Eritrea? Windhoek That is incorrect! It is Asmara. If Statements Task 4 ( True or False? ) Come up with your own true or false question that the user has to respond to. Depending on their answer , print whether they got it right or wrong . You may want to use an if statement with == for a correct answer or != for an incorrect answer , there's multiple ways to write this program. Example solutions: There are 140 million miles between Earth and Mars. TRUE or FALSE? TRUE That is correct! It is really that far! There are 140 million miles between Earth and Mars. TRUE or FALSE? FALSE You got it wrong, there really are 140 million miles between us! ⬅ Section 3 Practice Tasks 4b - Mathematical Operators ➡

Learn about applications, utility software, open source and closed source, translators including interpreters, compilers and assemblers, stages of compilation (lexical analysis, syntax analysis, code generation and optimisation) and linkers, loaders and libraries. Based on the OCR H446 Computer Science A-Level specification. Exam Board: OCR A-Level 2.2 - Applications Generation Specification: Computer Science H446 Watch on YouTube : Application software Utilities Open & closed source High & low level language Translators Stages of compilation Linkers, loaders & libraries This topic explores key types of software and how they support computer systems and users . It explains different kinds of applications , utilities , translators and compares open and closed source software . Another important concept is compilation , with knowledge required of its different stages , as well as linkers , loaders and software libraries . Applications Software Applications software allows users to carry out productive or creative activities such as document editing , data analysis , communication or media creation . Common examples include word processors (e.g. Microsoft Word or Google Docs ), spreadsheets (e.g. Excel or Sheets ), database management systems (e.g. Access ), web browsers (e.g. Chrome or Safari ) and graphics editors (e.g. Photoshop ). Applications can be general-purpose , serving many uses , or special-purpose , created for a specific function like payroll or medical record management . Utilities Utility software is system software designed to maintain , optimise and manage a computer’s performance , often running in the background to support the operating system . Examples include security tools like an antivirus , backup , compressors , disk management utilities and defragmenters . Defragmentation is the process of reorganising files on a hard drive so that parts of each file are stored together in contiguous blocks , improving access speed . Open Source & Closed Source Open source software has its source code (the actual code written by its developers ) made publicly available , allowing users to view , modify and share it freely . An open source licence encourages collaboration , transparency and community-driven improvement . However, it may lack official technical support or guaranteed updates . Closed source software has its source code private , restricting modification and redistribution . It is usually sold commercially with paid licences , regular updates and dedicated technical support . Bug fixes and quality assurance are out of the user's control , being managed by the developer . Support may end without warning . High & Low Level Languages Programming languages can be split into high-level and low-level , based on how close they are to the computer’s hardware . High-level languages are easier to read and write , while low-level languages give direct control over hardware but are harder to use . High-level languages like Python or Java are similar to natural human language, making them easy to write , understand, and debug . Low-level languages include machine code (binary ) and assembly language but are written for specific processor architecture . Translators Translators are programs that convert source code written in one programming language into another form that the computer's CPU can understand - typically machine code (binary ). An assembler translates assembly language into machine code that the CPU can execute directly . An interpreter translates and executes high-level code in a line-by-line method, stopping when an error occurs . A compiler translates the entire high-level program into machine code before execution , producing an executable file . Stages of Compilation Compilation is a complicated process to convert high-level program code into machine code . It consists of four key stages : Lexical analysis breaks the source code into tokens , such as keywords , identifiers and operators . Spaces and comments are removed and a symbol table of identifiers is created. Syntax analysis checks that the token sequence follows the grammatical rules of the programming language , building an abstract syntax tree . Code generation converts the abstract syntax tree into object code (unfinished machine code ) the CPU can understand . Code optimisation improves the efficiency of the generated code , for example by reducing redundant instructions or improving execution speed . Libraries, Linkers & Loaders Compilation also requires additional programs, such as a linker and loader and the use of libraries . A library is a collection of pre-written code created by other programmers that contains useful routines and functions which can be reused in a program. A linker combines object code and libraries , resolving references so that a final executable file can be created . A loader copies an executable file from secondary storage into RAM , ready for execution by the processor . Q uesto's K ey T erms Applications: database, word processor, web browser, graphics manipulation, spreadsheet software, presentation software Utilities: defragmentation, system cleanup, file manager, device driver, security tools Open & Closed Source: source code, open source, closed source Translators: assembler, interpreter, compiler, machine code Stages of Compilation: lexical analysis, token, syntax analysis, abstract syntax tree, code generation, code optimisation, library, linker, static linking, dynamic linking, loader D id Y ou K now? Grace Hopper , a US Navy rear admiral , is credited with creating one of the first compilers in 1952 and coining the term ' compiler '. She also helped develop the languages FLOW-MATIC and later COBOL , which is still used today . 2.1 - Systems Software A-Level Topics 2.3 Software Development

Learn about the five main roles of an operating system including CPU management, security, managing processes and the user interface. Based on the J277 OCR GCSE Computer Science specification (first taught from 2020 onwards). 5.1: Operating Systems Exam Board: OCR Specification: J277 Watch on YouTube : Operating Systems What is an Operating System? An operating system (OS ) is software that helps to manage the resources of a computer system and provide the interface between the user and the computer’s hardware . There are five main functions of an operating system: Memory Management & Multitasking All programs must be temporarily stored in RAM for the CPU to be able to process them. The OS transfers programs in and out of memory from the hard drive (or virtual memory ) when processing is required - programs are removed from RAM when closed to free up space for other tasks. The operating system can only perform one process at a time , but through memory management it can appear that more than one process is being executed - this is called multitasking . Peripherals Management & Drivers A peripheral is an external device connected to a computer system to input or output data . Data is transferred between external devices and the processor and this process needs to be managed by the operating system . A device driver is a program that provides an interface for the OS to interact and communicate with an external device . Drivers are hardware dependent and OS-specific . The driver translates the OS’ instructions into a format the specific hardware can understand . Because the CPU and the peripheral will process data at different speeds , a buffer is typically used to temporarily store data until it can be processed . User Management The OS allows users to create , manage and delete individual accounts . User accounts can be granted different access rights such as an administrator or guest . The OS will manage security settings such as allowing passwords to be reset and can also be used to monitor login activity . File Management The operating system creates and maintains a logical management system to organise files and directories (folders ). File management allows files to be named , renamed , opened , copied , moved , saved , searched for , sorted and deleted . It also allows users to set access rights for specific files and to view file properties . User Interface The final function of an operating system is to provide a user interface , allowing a human to interact with the computer system . The way in which a user can navigate a computer system is known as human-computer interaction ( HCI ). Graphical User Interface (GUI) The most common type of user interface is a graphical user interface (GUI ) which can be presented in the following ways: Icons are displayed to represent shortcuts to applications and files. Multiple windows can be opened at the same time and switched between. A folder and file system is displayed and manipulated allowing for copying , searching , sorting and deleting data. The interface can be customised , such as changing font sizes and the desktop background . The taskbar allows shortcuts to be pinned for quick access . Menus can be opened from the Start button to display files and shortcuts. System settings can be accessed such as network and hardware options . Command-Line Interface Other types of user interface do exist, such as a command-line interface (CLI ). This type of interface is entirely text-based and requires users to interact with the system by typing commands . This is a complicated process and mistakes could easily accidentally delete data. There are many commands to learn so only experts who have been trained t o learn this interface will be able to efficiently make use of it. Other Interfaces Humans can interact with computers using other types of interface , such as: Touch-sensitive interface (e.g. smartphones ). Voice-sensitive interface (e.g. smart speakers ). Menu-driven interface (e.g. ATMs in banks). Q uesto's Q uestions 5.1 - Operating Systems: 1. Describe each role of the operating system : Providing a user interface [ 3 ] Memory management (and multitasking) [ 3 ] Peripheral management (and drivers) [ 3 ] User management [ 3 ] File management [ 3 ] 2. Describe 5 different ways the operating system can provide a graphical user interface (GUI) . [5 ] 4.2 - Preventing Vulnerabilities Theory Topics 5.2 - Utility Software

Learn about different types of utility software including firewall, anti-virus, defragmenter, compressor and backup software. Based on the 2016 OCR Cambridge Technicals Level 3 IT specification. 2.3: Utility Software Exam Board: OCR Specification: 2016 - Unit 1 What is utility software? Utility software are dedicated programs used for the maintenance and organisation of a computer system. Antivirus Software Antivirus software is used to locate and delete viruses on a computer system. The antivirus scans each file on the computer and compares it against a database of known viruses . Files with similar features to viruses in the database are identified and deleted . There are thousands of known viruses but new ones are created each day by attackers so antivirus software must be regularly updated to keep systems secure. Other roles of an antivirus: Checking all incoming and outgoing emails and their attachments . Checking files as they are downloaded . Scanning the hard drive for viruses and deleting them . Firewall A firewall manages incoming and outgoing network traffic . Each data packet is processed to check whether it should be given access to the network by examining the source and destination address . Unexpected data packets will be filtered out and not accepted to the network. Defragmentation As files are edited over time they will become fragmented - this is when the file is split into parts that are stored in different locations on the hard disk drive . Files that are fragmented take longer to load and read because of the distance between the fragments of the file. Defragmentation software is used to rearrange the file on the hard disk drive so that all parts are together again in order. Defragmentation improves the speed of accessing data on the hard disk drive. Compression Compression is used to decrease the size of a file . This is beneficial as more files can be stored on a storage device if the size has been reduced. Compressed files can be transferred faster across a network because they are smaller in size . Monitors, Managers & Cleaners Other roles of a firewall include: Blocking access to insecure / malicious web sites . Blocking certain programs from accessing the internet . Blocking unexpected / unauthorised downloads . Preventing specific users on a network accessing certain files . Monitoring network ports . System monitors check the resources of a computer and display how much CPU time and memory current applications are using. Task managers allow a user to close processes and applications if they have stopped responding or if one is using too many resources. Press Ctrl + Alt + Delete on any Windows computer to open Windows Task Manager which is a system monitor and task manager tool. A disk cleaner is used to scan a hard disk drive and remove unused files . This is used to free up space on the hard drive. A disk scanner will scan a hard disc for any errors and attempt to repair them . Backing Up Data A backup is a copy of data that can be used if the original data is corrupted or lost . Backups of all data should be made regularly and stored in an alternative location . Alternatively, imaging (also known as disk cloning ) creates an identical image of a storage drive to be stored in a different location . Q uesto's Q uestions 2.3 - Utility Software: 1. What is the purpose of utility software ? [1 ] 2a. Describe how antivirus software works. [ 2 ] 2b. Describe 3 further roles of antivirus software . [ 3 ] 3a. What is the purpose of a firewall ? [ 2 ] 3b. Describe 3 further roles of a firewall . [ 3 ] 4a. Describe what is meant by defragmentation . [ 2 ] 4b. Explain why defragmentation software is used . [ 2 ] 5. Describe 2 benefits of using compression . [ 2 ] 6a. Explain why system monitor / task management software could be used . [ 2 ] 6b. Explain the purpose of disk cleaners and disk scanners . [ 2 ] 7a. Explain what a backup is and why they are are important. [ 2 ] 7b. Describe what imaging is. [ 2 ] 2.2 - Applications Software Topic List 2.4 - Operating Systems

Learn about the purpose and characteristics of the eight application types, including examples. Application types include communication, educational, entertainment, games, lifestyle, productivity, protection & utility and web browsers. Resources based on Unit F160 (Fundamentals of Application Development) for the OCR Cambridge Advanced National in Computing (H029 / H129) AAQ (Alternative Academic Qualification). Qualification: Cambridge Advanced National in Computing (AAQ) Unit: F160: Fundamentals of Application Development Certificate: Computing: Application Development (H029 / H129) 1.3.1 - Application Types Watch on YouTube : Application Types There are several types of applications that can be developed , each with a different purpose and common characteristics . There are eight application types you need to know for this 'Fundamentals of Application Development ' unit, including their purpose and common characteristics . Communication Purpose: Communication applications allow users to exchange information with others , most often in real-time . Data can be transferred in a range of formats including text , images and video . Education Purpose: To teach users about specific topics and help people learn new skills . This may be aimed at certain ages or user groups such as those learning a new language . Characteristics of Communication Applications: Has a simple user interface designed for quick and reliable data exchange . Supports multiple formats (text , images , audio , video and files ). Requires a network connection to send and receive data . Often has built-in security and privacy , such as end-to-end encryption . May use presence awareness such as showing ‘typing… ’ or ‘online now ’. Characteristics of Education Applications: It may be structured around learning milestones or long-term goals . Often interactive , such as quick quizzes or regular recaps of topics. Could include different formats of learning (such as text , visuals or audio ). Usually tracks skills or scores over time to show progress in a user-friendly way . Age-appropriate in content and design , possibly with difficulty levels . Examples: WhatsApp, Messenger, Zoom, Slack, Gmail Examples: Duolingo, Kahoot!, Quizlet, Memrise, Anki Entertainment Purpose: To provide enjoyment through formats such as video or audio , often with automatic suggestions based on previous interactions including watched videos , likes or comments . Characteristics of Entertainment Applications: Simple design to focus on keeping users engaged . May include streamed media content or the option to download . Designed for passive or relaxed use , e.g. watching or listening without interacting . Uses algorithms for recommendations based on user preferences . May include social features such as comments or sharing with friends . Examples: Netflix, Disney+, Spotify, YouTube, Twitch Games Purpose: To offer interactive challenges in a fun and possibly competitive way. Games may be played together online or offline for a single-player experience . Characteristics of Game Applications: Based on clear rules and objectives with reward systems , e.g. achievements . High interactivity and quick responsiveness to keep players engaged . Requires graphical rendering , user inputs and sound design . May support local multiplayer or online play with competition , like leaderboards . Often has a range of difficulty levels to keep players challenged . Examples: Minecraft, Fortnite, Among Us, EA Sports FC, Candy Crush Lifestyle Purpose: Supports a healthy and organised way of living . They often help people to manage their daily tasks and form positive personal routines . Productivity Purpose: To support users to complete tasks , manage their time or organise information in a helpful way , all to to maximise productivity . Characteristics of Lifestyle Applications: Often personalised to user preferences or personal data . May use real-time inputs such as location or health data , like steps taken . It may be integrated with smart wearable devices such as a smartwatch . Designed to be used briefly but daily (e.g. checking steps or logging meals ). Encourages improved habits or healthier improvements . Characteristics of Productivity Applications: Has a focus on efficiency , reliability and easy usability . Often allows collaboration and file sharing (e.g. working with colleagues ). Prioritises data organisation and quick access to relevant information . Usually integrated with cloud services or other apps like calendars . It may be designed for professional , personal or educational use . Examples: MyFitness Pal, Noom, Headspace, FitBit, Couch to 5k Examples: Microsoft Word, Calendar, Google Drive, Notion, Trello Protection & Utility Purpose: To secure the computer system against malicious threats and perform housekeeping tasks that maintain stability and a smooth performance . Characteristics of Protection & Utility Applications: Works in the background without frequent user interaction . Often requires permissions to access sensitive data . Needs to be updated frequently , e.g. adding new virus signatures to the database of an antivirus . May be event-driven (e.g. alerts or automatic scans at regular intervals ). Should use low system resources if it needs to be running constantly . Web Browsers Purpose: Accesses , retrieves and displays web pages from web servers . It provides tools like bookmarks , tabs and history to help users easily navigate the interne t. Characteristics of Web Browser Applications: Displays webpages that are built using HTML , CSS and JavaScript . Supports security protocols such as HTTPS , which uses encryption . Enables customisation and user control , e.g. bookmarks , extensions and themes . Contains an address bar to directly type in URLs or search terms . Allows for multiple tabs to run concurrently . Types of Application Examples: Avast Antivirus, CCleaner, 1Password, Battery Saver, Microsoft Defender Examples: Google Chrome, Safari, Mozilla Firefox, Microsoft Edge, Opera Q uesto's Q uestions 1.3.1 - Application Types: 1. Choose four application types and explain how each can be used in a school . [8 ] 2a. For two application types you did not mention in Q1 , explain their characteristics . [6 ] 2a. For the remaining two application types you have not mentioned , explain their purpose . [ 4 ] Minecraft is the best-selling video game of all time , with over 350 million copies sold since its official release in 2011 . D id Y ou K now? 1.2 - Operating Systems Topic List 1.3.2 - Application Software Categories

Test your ability to create a more complex program in Python based on a given scenario. Perfect for students learning GCSE Computer Science in UK schools. Extended Task 2 Lottery 17 8 4 13 20 Create a program to simulate a lottery draw. First, create an appropriate print line to welcome the user to your lottery draw. Then let the user enter five numbers between 1 and 20. Next, randomise five numbers between 1 and 20. Check to see how many numbers match and output an appropriate response for each scenario (e.g. “You have not matched any numbers, better luck next time!”) Once you have made the base program implement subroutines and lists . Make it as efficient as possible and professional-looking. Use pauses to reveal each number one at a time like a real lottery draw to build suspense. For this task, you will need to create a document and include the following sections (with screenshots where appropriate): An introduction to explain the Purpose of your program . A List of Requirements for a successful program. Screenshots of your code (with comments in your code to show understanding). Testing – Create a plan to show how you will test your program and then explanations of any errors that you found and how they were fixed . An Evaluation of what worked, what didn’t, and how you met each of your requirements from your original list. Also, discuss further improvements that you could have made to improve your program. Example solution: Helpful reminders for this task: Inputting Numbers Random Numbers Logical Operators Subroutines ⬅ Extended Task 1 (Pork Pies) Extended Task 3 (Blackjack) ➡

Learn how to create and use two-dimensional lists in Python. Try practice tasks and learn through text and images. Perfect for students learning GCSE Computer Science in UK schools. top Python 8b - 2D Lists Creating a List with Multiple Dimensions Lists can be given another dimension to hold data that is related to each other . A scenario: Three students have taken two Chemistry tests, and their teacher has recorded the results in a 2-dimensional array (note that Python does not use arrays but uses lists instead): To create this in Python: Printing a 2D List To print the whole list, use a for loop to cycle through each record. I have altered the normal i variable to be 'record', so it is more descriptive: Use the index number to print a specific record . Look at the table above and remember that Python starts counting at 0 so Edward is record 0, Bella 1 and Jacob 2: To print a specific data value, you need to define the record number and then the data index . When using 2D lists, the first value is the row, and the second value is the column . Use the table at the very top to help you visualise this: Practice Task 1 Use the introduction at the top to help you create a 2D list with three friends in the first column, their age in the second column and their favourite colour in the third column. Print the whole list. Then print just the second person's information. Example solution: Searching Through a 2D List To search through a multi-dimensional list then you need to search through each record and then each data element for a specific value: Practice Task 2 Use the 2D list that you created in the first practice task. Ask the user to enter a name. Search through the list and print the record of that person's name. Example solution: ⬅ 8a - Using Lists 8 c - Dictionaries ➡

Learn about the moral and ethical issues of computing such as computers in the workforce, automated decision making, artificial intelligence, environmental effects, censorship and the internet, monitor behaviour, analysing personal information, piracy and offensive communications, layout, colour paradigms and character sets. Based on the OCR H446 Computer Science A-Level specification. Exam Board: OCR A-Level Specification: Computer Science H446 5.2 - Moral & Ethical Issues Watch on YouTube : Moral & Ethical Issues #1 Moral & Ethical Issues #2 Artifical Intelligence Technology and the internet have transformed society , bringing huge benefits but also raising new ethical , social and environmental challenges . Below are some key modern issues linked to computing and digital systems . Moral & Ethical Issues Computers in the Workforce: Computers and automation have increased productivity and created new tech-based jobs , but they have also led to job losses in areas where machines can replace human labour . This raises concerns about unemployment and retraining in many industries . Automated Decision Making: Systems such as credit checks and recruitment tools now make decisions automatically using algorithms . While this can save time and reduce human bias , it can also lead to unfair or inaccurate outcomes if the data or programming is flawed . Artificial Intelligence (AI): AI allows machines to learn and make decisions without explicit human control , improving fields like healthcare and transport . However, it also raises ethical questions about accountability , job loss and the potential misuse of intelligent systems . Environmental Effects: Computers require energy to manufacture , use and dispose of , contributing to electronic waste and carbon emissions . Recycling and energy-efficient design can help reduce the environmental impact of modern technology . Censorship and the Internet: Some governments and organisations restrict access to information online to control what people can see or share . While this can protect users from harmful content , it can also limit freedom of expression and access to knowledge . Monitoring Behaviour: Digital systems and surveillance tools can track users’ actions , such as browsing history or location . This can improve safety and security but also raises privacy concerns about who collects this data and how it’s used . Analysing Personal Information: Companies and governments can collect and analyse large amounts of personal data to improve services or target advertising . However, this creates risks of data misuse , discrimination or identity theft if information isn’t protected properly. Piracy and Offensive Communications: The internet makes it easy to copy and share content illegally , such as music , films or software , leading to lost income for creators . It can also be a platform for offensive or harmful communication , such as trolling or cyberbullying , which can have serious social effects . Layout, Colour Paradigms, and Character Sets: Design choices like layout , colour schemes and character sets affect how accessible and inclusive digital content is. Using clear design , appropriate colours and Unicode character sets helps ensure that websites and software can be used by people of all languages and abilities . YouTube video uploading soon YouTube video uploading soon YouTube video uploading soon This page is under active development. Check here for the latest progress update. Q uesto's K ey T erms Moral & Ethical Issues: moral, social, ethical, cultural, opportunities, risks, computers in the workforce, automated decision making, artificial intelligence (AI), environmental effects, censorship, the internet, monitor behaviour, analysing personal information, piracy, offensive communications, layout, colour paradigms, character sets D id Y ou K now? In 2022 , the world generated 62 million tonnes of e-waste (roughly 7.8 kg per person globally) and only 22% of it was formally collected and recycled . 5.1 - Computing Legislation A-Level Topics

Learn about the decomposition methods used in project planning such as abstraction, pattern recognition, modularisation (top down and bottom up) and parsing of requirements. Based on Unit F160 (Fundamentals of Application Development) for the OCR Cambridge Advanced National in Computing (H029 / H129) (AAQ - Alternative Academic Qualification). Qualification: Cambridge Advanced National in Computing (AAQ) Unit: F160: Fundamentals of Application Development Certificate: Computing: Application Development (H029 / H129) 4.3 - Decomposition Methods Watch on YouTube : Abstraction Pattern Recognition Modularisation Parsing of Requirements Decomposition methods break complex problems or systems into smaller , more manageable parts . This makes development easier to plan , understand and implement . Decomposition also helps reduce errors and improve efficiency , as individual tasks can be more easily tested and debugged. For each of the four decomposition methods ( abstraction , pattern recognition , top-down and bottom-up modularisation and parsing requirements ) you need to know when each method is suitable to use , its advantages and disadvantages , how client requirements affect their selection and how they can be used to visualise application designs . Decomposition Methods Abstraction Abstraction is the process of simplifying a problem by ignoring irrelevant data and focusing only on the most important details . It is used in the early stages of design or planning , when managing complexity in large systems and when creating reusable components . Pattern Recognition Pattern recognition is used to identify similarities or trends in problems or client requirements . This allows for the reuse of existing components and aids in finding solutions for common issues . It is used during the planning or analysis phases and when dealing with similar tasks , inputs , outputs or processes . Modularisation Modularisation refers to the individual components that make up a larger project . In top-down modularisation , a larger system is broken down from a general overview into its most specific parts . The purpose of bottom-up modularisation is to build the system starting with the smaller , detailed components and combining them into larger subsystems . Parsing of Requirements To parse requirements means to systematically break down and analyse client requirements into actionable tasks or functions . It is used at the start of a project to ensure shared understanding between development teams and clients . Q uesto's Q uestions 4.3 - Decomposition Methods: 1. Explain the differences between top-down and bottom-up modularisation . [4 ] 2. Explain when abstraction would be an appropriate decomposition method to use. [3 ] 3. What are the advantages and disadvantages of parsing requirements ? [ 4 ] 4. Give one way each decomposition method can be used in software application development . [ 4 ] Alan Turing and his team used pattern recognition to analyse recurring sequences in encrypted German messages , helping to break the Enigma code , which was a major factor in the Allies’ victory in World War II . D id Y ou K now? 4.2 - Client Requirement Specs Topic List 5.1.1 - Human-Computer Interaction

The first part of a quick guide to the basics of Python aimed at Key Stage 3 students. Learn about comments and printing. Python - #1 - The Basics 1. Start with Commenting Programmers write A LOT of code. They need to understand exactly what they have written, especially if they are working as part of a team or returning to code after working on other projects. To help them understand what they have written, programmers use comments to annotate (explain) their code . Task 1 - Create a new Python program and use # to write a comment that says your name and the date. Save the file as 1-Basics.py In Python, type the # symbol then your message to write a comment. Comments are not printed when you run a program! It is a good idea to start every program with a comment, so you know what the program is about . 2. Printing to the Screen The most basic and common command you will use in Python is print . Inside the print brackets, you can write a message within speech marks . Your print command should turn purple - don't use any capital letters in Python unless it is inside speech marks! Task 2 - Write a nice message by using the print command, brackets and speech marks. Press F5 to run your program. 3. More Printing You can write multiple print lines one after another to print on different lines. Task 3 - Add two more print lines to your program. You can choose any message that you like. 4. New Lines You can use the special command \n to start a new line . This allows you to write on multiple lines but only use one print line. Use the backslash ( \ ) not the forward-slash ( / ). Task 4 - Use \n to write a 3 sentence conversation in only one line of code. Challenge Programs Use everything that you have learned on this page to help you create these programs... Challenge Task 1 - Days of the Week Create a new Python program. Save it as ' 1-Week.py ' Add a comment at the top with your name and the date. Create a program that prints the days of the week, with each day on a new line. BONUS : Try to use only one print line. BONUS : Have no empty spaces at the start of each line. When you run it, it should look like this: Challenge Task 2 - Conversation Create a new Python program. Save it as ' 1-Conversation.py ' Add a comment at the top with your name and the date. Create a program that prints a 6-line conversation between two people. It is up to you what these two people are talking about. BONUS : Try to use only one print line. BONUS : Have no empty spaces at the start of each line. When you run it, it could look something like this: #2 Variables >>>

Test your ability to create a more complex program in Python based on a given scenario. Perfect for students learning GCSE Computer Science in UK schools. Extended Task 3 Hi, Susanna here, I want to make a blackjack-like program that I can play for fun at home in between revising for Computer Science. The aim of my blackjack game is to get as close to 21 as possible with the most number of cards, without going over. So... The user can choose whether to be hit with a new card (a number between 1 and 8) or fold and stop. Each number they are dealt adds up to their total . If the total goes over 21, then they lose . If they bust (when over 21) or folded then their final number and their number of cards is displayed . Blackjack For this task, you will need to create a document and include the following sections (with screenshots where appropriate): An introduction to explain the Purpose of your program . A List of Requirements for a successful program. Screenshots of your code (with comments in your code to show understanding). Testing – Create a plan to show how you will test your program and then explanations of any errors that you found and how they were fixed . An Evaluation of what worked, what didn’t, and how you met each of your requirements from your original list. Also, discuss further improvements that you could have made to improve your program. Example solution: Helpful reminders for this task: Think about the type of loop that you need. Will you need more than one loop? What variables will you need? Remember to use an input . What will you ask the user? How will you use their response? Remember to use ‘import random’ and randint to create a random number . What outputs do you need and when? What should you display… After each hand? At the beginning? At the end? ⬅ Extended Task 2 (Lottery) Extended Task 4 (Vet Surgery) ➡

The final part of a quick guide to the basics of Python aimed at Key Stage 3 students. Learn about importing turtle to command a moving object. Python - Iteration For Loops Editor Execute A for loop is a count controlled loop. It repeats for a certain number of times as stated in the range brackets. The first number (1) states the number to start on . The second number is an exclusive end . This means it actually finishes on the number before . (11 will end on 10). You need a colon at the end of the loop line . Each line to be repeated must be indented (press the tab key). You can use the loop number within the loop itself. 1. Write a for loop to print your name 8 times . (Count it to double-check it prints eight times.) 2. Use a for loop to print each number between 10 and 50 . 3. Use a for loop from 1 to 10 . Print the 3 times table by multiplying number by 3 underneath the loop. 4. Ask the user to input a whole number (call it num1 ). Write num1 in your range brackets to repeat any message that many times. 5. Ask the user to input a whole number (call it num1 ) and then input a word . Print the word by the number they entered . (Hint: Use num1 in the range.) 6. Delete your code and copy these 3 lines: #Delete the space after the colon for number in range(0,21,2): print(number) What happens when you run this code? 7. Use Q6 to help you print 0 to 100 , going up in 5s . Think about the 3 values you need in the range brackets. 8. Use Q6 to help you print 100 down to 0 , backwards by 1 . Think about the 3 values you need in the range brackets. Tasks While Loops Editor Execute A while loop is a condition controlled loop . While loops repeat as long as the condition is true . As soon as the condition becomes false , the loop will end . 1. Change the program in the editor to repeat the loop while a number is not equal to 33 . 2. Make a new while loop that asks the user to enter a whole number . While the number is less than or equal to 1000 , keep repeating. 3. Make a new while loop for while a colour is not equal to purple (or any colour you want). Ask the user to enter a colour inside of the loop . Don't forget to set colour to "" before you start. 4. Edit your colour program to count how many guesses were made. Make a new variable called count and set it to 0 at the start of the program. Increase it by 1 in the loop, using count = count + 1 . 5. While a total is less than 100 , ask the user to input a decimal number . When it is over 100 , print ‘COMPUTER OVERLOAD’ . You need a variable called total . Increase the total each time with total = total + number . Don't forget to start it at 0 . Tasks != means ‘not equal to ’. The loop below will repeat as long as the password is not equal to “abc123” . Any variable you use in your condition must have a value first . You can’t check for your password if it doesn’t exist. That’s why I have written password = “” , to give password a value before we check it .