In the social sciences, triangulation refers to the application and combination of several research methods in the study of the same phenomenon.
[1] By combining multiple observers, theories, methods, and empirical materials, researchers hope to overcome the weakness or intrinsic biases and the problems that come from single method, single-observer, and single-theory studies.
"[2] Triangulation can be used in both quantitative and qualitative studies as an alternative to traditional criteria like reliability and validity.
The purpose of triangulation in qualitative research is to increase the credibility and validity of the results.
Denzin (2006) identified four basic types of triangulation:[6] Cohen, L., Mansion, L. and Morrison, K. (2000).