alytical data in such a way that the customer can readily understand it and draw appropriate conclusions. Method validation enables chemists to demonstrate that a method is ‘fit for purpose’. 4.4 For an analytical result to be fit for its intended purpose it must be sufficiently reliable that any decision based on it can be taken with confidence. Thus the method performance must be validated and the uncertainty on the result, at a given level of confidence, estimated. Uncertainty should be evaluated and quoted in a way that is widely recognised, internally consistent and easy to interpret. Most of the information required to evaluate uncertainty can be obtained during validation of the method. This topic is dealt with briefly in section 6; further guidance is listed in the bibliography.
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