Critical analysis of investor behavior as a result of the economic and financial crisis in Spain; a case study of financial institutions.a?

The assignment requirement: Analysis the research onion diagram, which include Research Philosophy. Research Approach, Research Strategy: Interview. Research design, and data collection methods (secondary data and primary data).
The most important is to define the concepts and emphasize that the research strategy will be interview

For my assignment the references must be from 2010 onwords, Thank you