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University of Bristol
Wellcome Trust
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What is evidence?

Students need to appreciate that scientific theories must be supported by evidence. But what is evidence?

Evidence is usually considered to be data from survey or experiment or previous research. However, realistically it relates to more than just hard facts. It embraces the results of analyses and consultations and so includes opinions, judgments and beliefs. The experimenter effect is well known when scientists interpret their results.

The evidence base for a theory is not static; it changes constantly as scientist's understanding changes and as new research results come in. When the evidence isn’t clear cut scientists will assign a level of confidence to their prediction from the data. You can read more about this in Understanding the Maths


Evidence collected by scientists is also used to create models of processes in order to understand them and to be able to make predictions however these models have limitations. They are likely to be simplifications and it is difficult to generalise from one model developed using data in one context to another context.

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Lauren Phipps 15-07-08 13:35
i found this website very boring
it needs more pictures and it needs to be made more interesting

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The Association for Science Education have produced an UPD8 activity on assessing the evidence for global warming. Is it easy to complete?