Research evidence is an important form of information in societal decision making. The conduct and use of evidence synthesis does not only require methods and capacity, it requires policies and systems by which it can be enabled, monitored, accessed, used, and evaluated and integrated into broader systems for planning and decision making. Without these, evidence may not be used or might be used in a partial way that does not represent the totality of relevant evidence (through lack of access, lack of rigor or due to non-transparent perspectives and interests).