This guide is an attempt to redress the deficit in understanding of implementation research and to encourage programme personnel and implementers to take a greater interest in the subject, recognizing that implementation research is in fact an integral part of programme planning and execution, rather than something that happens once programmes are up and running. Intended for newcomers to the field, those already conducting implementation research, and those with responsibility for implementing programmes, the guide provides an introduction to basic implementation research concepts and language, briefly outlines what it involves, and describes the many exciting opportunities that it presents