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Big medical datasets pose a serious problem. Thousands of patients鈥� health records are an enormous risk to personal privacy. But they also contain an enormous opportunity 鈥� they could show us how to provide better treatments or more effective health policies.

A system called OpenSAFELY has been designed to solve this problem, with the help of a computer code 鈥渞obot鈥�.

Professor Ben Goldacre, director of the Bennett Institute for Applied Data Science at the University of Oxford, explains how it works.
Presenter: Tim Harford
Producer: Tom Colls
Production co-ordinator: Janet Staples
Sound mix: Hal Haines
Editor: Charlotte McDonald