The present commentary considers a paper by Silva, Silva, and Machado (2019) published in this special issue, which describes some relations between Behavioral Systems Theory and Interbehavioral Psychology. In particular, the systems aspects, field orientation, and role of experimentation in both Behavioral Systems Theory and Interbehavioral Psychology are discussed. Similarities and differences among the two perspectives are highlighted, and misconceptions about Interbehavioral Psychology are addressed.