Synthesis and triangulation among multiple sources of information and multiple types of methods can strengthen the quality and credibility of the evidentiary support for findings and recommendations, especially in complex interventions where any single data source will have inherent limitations. A theory of change provides an analytical framework for triangulation, but the theory may need to change as data are analyzed. Triangulation has benefited from the development of protocols, procedures, and methodologies. Triangulation benefits from multidisciplinary teams of investigators.
