Methodology? Research design? Research method?

Methodology: Philosophical framework and the fundamental assumptions of research (van Manen, 1990)

Research Design: The plan of action that links the philosophical assumptions to specific methods (Creswell, 2003; Crotty, 1998)

Research Method: Techniques of data collection and analysis such as quantitative standardized instrument or qualitative theme analysis of text data (Creswell, 2003; van Manen, 1990)