Riege, Andreas M. - In: Qualitative Market Research: An International Journal 6 (2003) 2, pp. 75-86
Despite the advantages of the case study method, its reliability and validity remain in doubt. Tests to establish the … validity and reliability of qualitative data are important to determine the stability and quality of the data obtained. However …, there is no single, coherent set of validity and reliability tests for each research phase in case study research available …