[Rapid reviews for evidence-based decision support. (Restricting) requirements].

Since evidence-based decision making is increasingly gaining acceptance among German health care authorities the need for evidence-based support for time-critical decisions becomes obvious. The best method to identify and summarize the available evidence is the conduct of systematic reviews of the literature. However, generally systematic reviews are not applicable in matters of urgency, because of their time consuming preparation. Concepts for "rapid reviews" are urgently required which ensure that these reviews still produce reliable results. The article proposes strategies to accelerate the preparation of a systematic review and discusses their possible influences on the conclusions of the review. Research efforts are needed to clarify which of the accelerations actually yield valid results.