Fitness, Efficiency, Robustness and Readability
Evaluate software against requirements and evidence about coding efficiency, robustness and readability.
How to study National 5 Computing Science
Move from functional requirements to designs and implementation, trace data and code carefully, and support testing and evaluation with evidence.
Core concepts
Concept 1
Fitness for purpose is judged against the stated functional requirements.
Exam cue: Name the criterion, cite evidence from the solution, then explain its effect.
Concept 2
Robustness concerns safe handling of invalid or unexpected conditions; efficiency concerns appropriate constructs and avoiding unnecessary work.
Exam cue: Tie every fitness judgement to a specific requirement.
Concept 3
Readable code uses internal commentary, meaningful identifiers, indentation and white space.
Risk pitfalls and guardrails
Claiming fitness for purpose merely because the program runs.
Guardrail: Check option route, data type, valid boundary, loop condition, array index, identifier and expected output before committing to the response.
Calling comments meaningful identifiers or indentation.
Guardrail: Check option route, data type, valid boundary, loop condition, array index, identifier and expected output before committing to the response.
Memory anchors
Fitness for purpose
The solution satisfies its stated functional requirements.
Efficient constructs
The program uses suitable logic without avoidable repetition or complexity.
Robustness
The solution handles invalid or unexpected conditions appropriately.
Internal commentary
Comments explain the purpose of code without restating every line.
Meaningful identifier
A variable or array name communicates what its value represents.
Readable layout
Consistent indentation and white space make structure clear.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Which evidence shows an error is intermittent?
A test uses invalid text where a number is required. What should robust software do?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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