Republished research: Implementation research: what it is and how to do it: Implementation research is a growing but not well understood field of health research that can contribute to more effective public health and clinical policies and programmes. This article provides a broad definition of implementation research and outlines key principles for how to do it. Issue 8 (23rd March 2014) - Peters, David H; Adam, Taghreed; Alonge, Olakunle; Agyepong, Irene Akua; Tran, Nhan