Understanding and Using Scientific Evidence shows that there are things to understand about scientific evidence, difficult concepts about the structure of experiments; causality; repeatability and the validity and reliability of evidence - upon which decisions have to be made. Once teachers understand this problem, they will look at those ideas and plan them into the curriculum. But in doing so, they need help to: * recognise what the problems are * enhance their own understanding of them * think how best to teach for understanding. The authors present a range of resources so that when teachers see 'fair test' or 'reliability' in The National Curriculum, they can look it up and develop their own understanding of how evidence is collected, analyzed and evaluated.