IB Computer Science 2027 – B2.3.4 Functions and modular code – Lesson & Worksheet

Bespoke, fully editable lesson for the new IB Diploma Computer Science syllabus (first assessment 2027): B2.3.4 Functions and modular code. Slides, worksheet and full answers.

Written for the 2027 IB Computer Science guide, unit B2 Programming. Everything is editable, so you can adapt it to your class.

What’s included

• PowerPoint lesson (13 slides) with speaker notes on every slide
• Student worksheet (Word), ready to print or edit
• Answer sheet (Word) with model answers for every question

B2.3.4 Functions and modular code

By the end of the lesson students can:

• Define and call functions with parameters and return values
• Explain the difference between local and global scope
• Split a problem into functions so code is easier to test, reuse and maintain

Worksheet sections: A. Key words; B. Trace the calls; C. Write the functions; D. Split it up; E. Challenge

Every lesson includes

• Learning goals and a starter question
• Clear explanations with worked examples (Python where code is needed)
• A quick check and a “your turn” task linked to the worksheet
• An exit ticket

Format

• PowerPoint (.pptx) and Word (.docx), fully editable
• Works in PowerPoint and Google Slides
• Calm pastel design, consistent across the whole IB course

These are independent resources written for the IB Diploma Programme Computer Science guide (first assessment 2027). They are not produced or endorsed by the International Baccalaureate Organization.