praxeology
noun
prax·e·ol·o·gy ˌprak-sē-ˈä-lə-jē 
: the study of human action and conduct
praxeological
ˌprak-sē-ə-ˈlä-ji-kəl
adjective 
Word History
Etymology
alteration of earlier praxiology, from praxis + -o- + -logy
First Known Use
1886, in the meaning defined above