This module covers the physical parts of a computer system, the software that runs on it, how data moves from input to output, and how real-world quantities become digital data. It is the vocabulary base for the rest of ICT, because later topics on networks, security and applications all assume you can name and compare these parts.
Check the current Cambridge IGCSE ICT 0417 syllabus for the exact list of devices and terms. The skills here stay the same across versions: name, classify, compare and justify.
What do you need before starting?
Very little. You should be comfortable using a computer and reading a short scenario. Bytes, kilobytes and megabytes appear in the storage lesson, so a quick look at the basic unit sizes helps.
An orienting example
A school needs a device for a teacher who marks work at home, on the bus and in class. She needs to type, read documents and carry it daily.
A good answer names a laptop or tablet and links each reason to her needs: it is portable, it has a keyboard or can take one, its battery lasts through the day, and its screen is large enough to read documents. A weak answer says “a laptop because it is good”. The marks sit in the link between the feature and the need.
What order should you study the lessons in?
- Choose a device for a stated task: start here, because it teaches the justify-by-scenario habit used in every other lesson.
- Distinguish system and application software: a clean classification skill that is easy to practise and easy to lose marks on.
- Compare storage types using a requirement: reuses the scenario habit, with simple capacity arithmetic added.
- Explain an input-output pathway: follows data through a whole system, so it pulls the earlier lessons together.
- Separate an analogue quantity from its digital representation: the most abstract idea in the module, easier once the pathway is clear.
Which traps catch students in this module?
- Naming a part without tying it to the scenario.
- Giving one-word answers such as “faster” or “bigger” with no comparison.
- Mixing up system software and application software.
- Treating storage as an output device.
- Saying a sensor produces digital data directly.
How should you use the practice set?
Try the mixed practice set after at least three lessons, writing full sentences before opening each answer. The practical task and evidence checker shows how scenario-based work is checked, and the read-only SQL practice lab is a gentle way to see stored data in action.
For revision beyond this module, our online one-to-one ICT tuition page explains how lessons with an assigned teacher work.