Lesson 5: Web crawlers

Pupils learn how search engines work, specifically; the role of a web index, what can affect pagerank and the role of web crawlers

Before the lesson

Download classroom resources

Learning objective

  • To understand how search engines work

National curriculum

Pupils should be taught to:

  • Use search technologies effectively, appreciate how results are selected and ranked, and be discerning in evaluating digital content

Success criteria

Cross-curricular links

Attention grabber

Main event


Pupils needing extra support: Regularly draw parallels between search engines and the unplugged activity.


Pupils working at greater depth: Suggest ways in which these pupils could improve a website to make it rank higher.

Wrapping up

Assessing pupils' progress and understanding


Created by:
Sway Grantham,  
Computing specialist
Sway Grantham (@SwayGrantham) is a Primary School Teacher, a CAS Master Teacher and Specialist Leader in Education for Primary ICT. She also has a BCS Certificate in Computer Science Teaching (Primary). She has written several curricula and conducted research into the…
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