Evidence based practice is funded upon a systematic review of research and related literature. This extends to many reports and papers, spanning several different types of evidence. Critical reading involves asking different sorts of questions of each type of evidence. The process of evaluating such literature may be lengthy, and demand collaborative efforts amongst midwives, who draw upon local expertise in research, or one of the relevant databases. Changes in practice is mandated where midwives can point to sufficient systematically evaluated evidence in support of adjusted ways of delivering midwifery care.