Design of the commissioning software for the AGS to RHIC transfer line

RHIC accelerator physicists and engineers have collaboratively specified the control system software for the commissioning of the AGS to RHIC transfer line (ATR) to occur in the fall of 1995. This paper summarizes the design and progress to date. We discuss the basic physics/engineering device model that we use to understand process and data flows, and describe the architecture and tools we will use to build the application level software.