[A new generation of reliable clinical practice guidelines through MAGIC].

Safe and effective disease diagnosis and treatment requires that health personnel can access the best evidence, preferably through reliable clinical practice guidelines. Most guidelines have methodological weaknesses, suboptimal reporting formats, and frequently fail to update content. New standards developed by the US Institute of Medicine and the Guidelines International Network and Systems for Trustworthy Guidelines offer better opportunities for success in the development of guidelines, but also increase the demand for methodological competence, clinical experience and time.