With the uptake of business process modeling in practice, the demand grows for guidelines that lead organizations to consistent and integrated collections of process models. The notion of a business process architecture has been explicitly proposed to address this issue. This paper provides an overview and comparison of the prevailing approaches to design such a business process architecture. Furthermore, it includes an evaluation of the usability and actual use of the identified approaches through our interaction with a large group of practitioners. Our findings suggest that practitioners heavily rely on a mix of guidelines instead of embracing any single approach wholeheartedly