Why is Contextualism "a-ontological" and Why is Behavior Analysis Contextualistic?

Dermot Barnes-Holmes's fun PowerPoint (the BA pdf) below describes answers to both of these questions.

For a detailed paper on this general topic you might start with Hayes, S. C., Hayes, L. J., & Reese, H. W. (1988). Finding the philosophical core: A review of Stephen C. Pepper's World Hypotheses. Journal of the Experimental Analysis of Behavior, 50, 97-111. Like most key ACT / RFT / CBS publications it can be downloaded from the publications list on the site but for convenience it is attached below.