Guest Editors' Reflections on Progress in the Development of Advanced Practice Nursing in Canada.

This 2016 special edition on advanced practice nursing (APN) roles in Canada builds on earlier role progress reported in the first special edition in 2010. Advancements in role development and innovative models that utilize APN roles are highlighted. The need for further efforts to support health systems integration of APN roles related to funding, research and decision-maker understanding of the roles, and to learn from international experience in APN role implementation are described.