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How we measure impact
We use baseline and endline surveys to generate evidence as to whether a campaign has had an impact. Sample sizes typically range from 1,000 to 5,000 (but in the case of our randomised controlled trial in Burkina Faso, we have gone much further, surveying 50,000 children at baseline and 100,000 at endline).
When measuring impact, we are looking to collect data at every stage of the process:
When working on child health campaigns, we can go one stage further and ask whether a child's life was saved as a result of the behaviour change.