Theory Based Evaluation

“Combining outcome data with an understanding of the process that led to those outcomes”

W.K. Kellogg Foundation (2010) Evaluation Handbook
http://wkkf.org/resource-directory/resource/2010/w-k-kellogg-foundation-evaluation-handbook

Triangulation

“Triangulation, first used in 1959, is defined as a combination of multi methods in a study of the same object or event to depict more accurately the phenomenon being investigated”.
http://www.ncbi.nlm.nih.gov/pubmed/8514935