The relationship between executive involvement and participation with the successful use of Information Technology (IT) has been a frequent topic of research. This paper explores the relationship between two concepts: domain integration (the fit between business and IT strategies) and IT as a core competency. Using a sample of 87 Southeast Michigan manufacturing firms, the author supports a positive relationship. Potential factors to help explain the relationship, including firm size, business changes, IT outsourcing, executive desire to outsource and IT department power are explored for possible influence.