AS 91371 · 4 credits · External
Computer science concepts
Demonstrate understanding of advanced concepts from computer science
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In plain EnglishAI study guide · check the NZQA standard
This standard asks you to understand three big ideas from computer science: how computers represent different types of data using bits, how information gets encoded (compressed, protected from errors, or encrypted), and what makes computer interfaces easy or hard to use. You'll need to describe these concepts, explain why they matter, and evaluate real examples.
What to do, grades and common mistakes
What you actually do
- ·Describe how different types of data (like numbers, text, colours, sound, and images) are represented using bits in a computer
- ·Explain encoding concepts: compression (making files smaller), error control coding (protecting data from damage), and encryption (keeping information secret), plus give real-world examples of where each is used
- ·Identify and describe usability heuristics (practical rules for good design) and find examples of them in human-computer interfaces
- ·Compare and contrast different data representation methods and discuss what their advantages and disadvantages are
- ·Evaluate how encoding technologies enable widely used systems (like video streaming, email, or digital banking)
AAchieved
You describe the main ideas (data representation, encoding types, and usability heuristics) and give basic examples of how they work in real systems.
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