Free sample · IB CS Hub · IB Diploma Computer Science · 2027 syllabus

IB Computer Science IA Guide — Free Sample

The Internal Assessment is a self-built, coded software product with supporting documentation, marked against five tasks (A–E) worth 30 marks total. Below is a real sample of our guide for Task A. Also see the syllabus guide and free glossary.

The five tasks, at a glance

Task A · 4 marks

Problem Specification

Task B · 4 marks

Planning

Task C · 6 marks

System Overview

Task D · 12 marks

Development

Task E · 4 marks

Evaluation

Sample · Task A

Problem Specification (4 marks)

Official mark bands

1–2 marks: Outlines a problem scenario. States limited success criteria. Outlines the nature of the solution in a computational context.

3–4 marks: Describes the problem scenario in terms of its measurable solution requirements. States appropriate success criteria. Explains the choice of computational context for the solution.

What examiners check for

A target demographic identified — a user group, not one named formal client.
The core inefficiency in the current real-world situation, described specifically.
Why software (vs. a non-software fix) actually solves it.
5–7 measurable success criteria, each testable as a binary yes/no — not vague adjectives like “easy to use.”

Common mistake

Writing subjective success criteria such as “the app will be easy to use and fast” — examiners can't test that objectively. Rewrite as something measurable: “a user can complete a booking in under 60 seconds.”

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