This paper describes specific object-oriented system development cases that resulted from interviews with system developers in a variety of large Midwestern firms. Four object-oriented projects are described, reflecting thediversity of the types of systems and types of technology involved. A few typical issues are discussed. This is the first phase of a research project that seeks to understand issues related to object-oriented development. Additional research is planned todefine and measure key development issues, and this will require developing a instrument based on the findings from these cases.