Cambridge A Level Computer Science 9618 – P4.24 Serial, sequential and random files

Bespoke, fully editable lesson for Cambridge International AS & A Level Computer Science (9618): P4.24 Serial, sequential and random files. Slides, worksheet and full answers.

Written for Paper 4 Practical, section 20 Further programming (syllabus 20.2.1). Everything is editable, so you can adapt it to your class.

What’s included

• PowerPoint lesson (15 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

P4.24 Serial, sequential and random files

By the end of the lesson students can:

• Describe serial, sequential and random file organisation and choose one for a problem
• Add a record to a sequential file by copying it to a new file
• Read and write fixed-length records in a random file, with SEEK, GETRECORD and PUTRECORD in pseudocode and seek() in Python

Worksheet sections: A. Organisation and access; B. Hashing; C. Write the record functions; D. Exam-style questions; E. Challenge: collisions

Every lesson includes

• Learning goals and a starter question
• Clear explanations, diagrams and worked examples (Cambridge pseudocode, as in the 2027–2029 pseudocode guide, with Python 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
• Calm, muted sixth-form design, consistent across the whole course

These are independent resources written for the Cambridge International AS & A Level Computer Science syllabus (9618) for examination in 2027, 2028 and 2029. They are not produced or endorsed by Cambridge University Press & Assessment. Syllabus point numbers are our own numbering of the syllabus statements.