Readings:

• Chapter 1 in Dooley, David. 2000. “The Logic of Social Research: ruling out rival hypotheses.” in Social Science Research Methods, edited by David Dooley: Prentice Hall.
• Creswell, John. 2003. Research Design: Qualitative, Quantitative, and Mixed Methods Approaches. Thousand Oaks, CA: Sage Publications. (Chapter  9).