Method validation is recognised as an essential part of good measurement practice. It cannot be guaranteed that analytical data will be fit-for-purpose unless the performance of the test method has been studied and demonstrated to be adequate. Quality standards such as ISO/IEC 17025, 'General requirements for the competence of testing and calibration laboratories', place considerable emphasis on the validation of test methods. Laboratories often spend a substantial amount of time and effort on method validation but it is not always a straightforward activity. This seminar will provide a valuable introduction to the topic. The morning session, delivered by experienced trainers from LGC's Quality Assurance training courses, will discuss approaches to evaluating key method performance parameters. The afternoon session will include case studies illustrating how method validation can be carried out in practice.