What is the best intro book for set theoretic research? I am a practitioner who also does some research. Need to explain research findings to business/government employees, not academics/researchers.
If you are not so much interested in the last developments, I think you are still well served with Rihoux/Ragin's edited volume: http://amzn.to/2mXDiYG
If you want to get a more comprehensive view out of hand, try Schneider/Wagemann: http://bit.ly/2mXywuo
For a very recently published, concise methods tutorial on how to understand, perform and interpret QCA, see this article in the American Journal of Evaluation: http://journals.sagepub.com/doi/full/10.1177/1098214016673902.
A replication file that you can use is available at http://www.alrik-thiem.net/about/ (entry 21 in Articles; note also the small corrigendum there).
If you have any further questions relating to this material, do not hesitate to ask.
1. Ragin C. 1987. The comparative method. Moving beyond qualitative and quantitative strategies. University of California Press: Berkley, Los Angeles, and London. [First textbook, nice to understand the starting point]
2. Ragin C. 2008. Redesigning social inquiry. University of Chicago Press: Chicago. [Nice update from the original version, very concise]
3. Schneider C, Wagemann C. 2013. Set-Theoretic Methods for the Social Sciences: A Guide to Qualitative Comparative Analysis. Cambridge University Press: Cambridge, UK. [I think the most recent textbook, very comprehensive]
P.S.: If you're interested in a method that generalizes QCA to handle more complex analytical problems, there's also a method called Coincidence Analysis that might be helpful in your case.
A less technical introduction can be found here: http://fmx.sagepub.com/content/25/1/3.abstract and a corresponding article on how to use the software for this method can be found here: https://journal.r-project.org/archive/2015-1/baumgartner-thiem.pdf