CourseAI Engineering: The Complete Course · Module 8: Retrieval-Augmented Generation (RAG) · part 62 of 105

Part 62 · Module 8: Retrieval-Augmented Generation (RAG)

Lesson 3: Finding the right chunk for every ticket

21 min read·13 Oct 2026

Module 8 · Lesson 3 · About 45 minutes · Needs: Module 5 Lesson 2 (BM25 and embeddings), Module 8 Lesson 1 (chunking)

The situation

Aisha Rahman writes: "The vacuum stopped charging after 3 months." The answer engine should quote HC-05 "What the warranty covers" or HC-06 "Making a warranty claim". In Module 4 the nearest article was HC-12 "Setting up your robot vacuum", and Priya has seen set-up tips sent to customers with broken machines.

Lesson 1 cut the help centre into chunks. This lesson is retrieval: picking the few chunks the model reads before it answers. If the right chunk is not picked, nothing later can fix it.

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