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Unit 1 Principles of Computer Science 2026 | Study Guide, Practice Questions, Answers, Rationales & Exam Review

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Prepare for Unit 1 Principles of Computer Science with focused study material covering foundational computer science concepts, programming and coding fundamentals, algorithms, data structures, computer systems, computational thinking, software development, problem-solving, and key terminology. Includes practice questions, answers, and rationales to reinforce essential concepts and support effective Unit 1 revision, exam preparation, and review.

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Unit 1 Principles of
Computer Science 2026 |
Study Guide, Practice
Questions, Answers,
Rationales & Exam Review
| Complete Ethics Study
Guide




Updated 2026 Questions and Answers
100% Verified Exam Prep and Comprehensive
Rationales
Included

, Decomposition The process if breaking down complex ideas into smaller, more manageable parts
making it easier to solve a problem



Pattern recognition The ability to see recurring attributes within the same problem and between different
problems



Abstraction Hiding data or details from the user making it easier to develop the program




Algorithm a step-by-step procedure for solving a problem that is independent of any
programming language



Pseudocode a high-level description of the actions of a program or algorithm that is independent
of any programming language



Identifier a programmer-friendly name which represents a value stored in a computers
memory



Declaring an identifier Assigning a name and a data type to a value that is being stored in a computers
memory



Variable An identifier that can have its value changed during the execution of a program




Constant An identifier that cannot have its value changed during the execution of a program




Local variable An identifier that can only be used in the block of code where it is declared




Global variable An identifier that can be used from anywhere in the program




camelCase A naming convention that starts each identifier with a lowercase letter and an
uppercase for each subsequent word in the identifier e.g. userPassword

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