Case studies usually use a combination of data-gathering methods
(Eisenhardt, 1989; Fossey et al., 2002) referred to as triangulation. “Triangulation
made possible by multiple data collection methods provides stronger substantiation on constructs and hypotheses” (Eisenhardt, 1989: 538). In order to enhance the quality of data and have a more holistic view of the researched problem, the empirical material of the present research consists of semi-structured interviews (with key actors such as the manager of the social enterprise), observations and casual conversations and secondary sources such as archives (mainly documents submitted by the organizations for TSEO, interview articles in magazine, and books). This strategy helps the researcher to develop a more complex understandingof the phenomenon being studied, and at the same time increasing the validity and reliability of the findings.