SummaryThe dichotomy between ‘scientific’ and ‘practical’ approaches to guideline development is false and divisive. Instead we should concentrate on developing mechanisms to develop and implement valid guidelines to improve patient care. The development of valid guidelines requires considerable expertise and is time consuming and expensive. It is most efficiently done at a regional or national level. The implementation of valid guidelines requires local action including the identification and modification of valid guidelines and a coordinated evidence-based implementation strategy (Grimshaw & Eccles (...) 1998). (shrink)