COMPLUS undertakes a range of study activities including landscape analysis, in-depth qualitative research, and tracking of selected indicators from available secondary data, to investigate the implementation of the intervention across the three country contexts emerging from the research, and their linkages with outcomes. It employs use of ‘tracers’, which are specific service delivery areas of importance that can be used as examples to guide and allow investigators to focus their inquiry on tangible outcomes. We are using Tuberculosis and Non-Communicable diseases (diabetes) as tracers to study different types of aspects of utilisation and responsiveness of health services.