OCR GCSE Computer Science J277 – OC2.51 Refining algorithms – Lesson & Worksheet

Bespoke, fully editable lesson for OCR GCSE (9–1) Computer Science (J277): OC2.51 Refining algorithms. Slides, worksheet and full answers.

Written for J277/02 Computational thinking, algorithms and programming, section 2.3 Producing robust programs (spec 2.3.2.5, 2.1.2.3). Everything is editable, so you can adapt it to your class.

What’s included

• PowerPoint lesson (14 slides) with teacher notes on every slide
• Student worksheet (Word), ready to print or edit
• Answer sheet (Word) with mark-scheme style answers for every question

OC2.51 Refining algorithms

By the end of the lesson students can:

• Explain what refining an algorithm means and why programmers do it
• Refine algorithms to make them shorter, more efficient, correct and robust
• Answer “refine” questions in ERL or Python and test that the refined version still works

Worksheet sections: A. Key words; B. Spot the refinement; C. Refine and re-test in Python; D. Exam-style questions; E. Challenge

Every lesson includes

• Learning goals and a starter question
• Clear explanations, diagrams and worked examples (Python 3 throughout, with the OCR Exam Reference Language alongside)
• A quick check and a “your turn” task linked to the worksheet
• Exam-style questions with marks, and an exit ticket

Format

• PowerPoint (.pptx) and Word (.docx), fully editable
• Works in PowerPoint and Google Slides
• Bright, clear GCSE design, consistent across the whole course

These are independent resources written for the Cambridge OCR GCSE (9–1) Computer Science specification (J277, version 3.1). They are not produced or endorsed by OCR or Cambridge University Press & Assessment. Spec point numbers are our own numbering of the specification statements.