Stan Pasky & Greg Banks WAO'98 Abstract. Abstract: The Advance Photon Source at Argonne National Laboratory is a Third Generation Light Source built in the 1990s. Like the machine itself, the Main Control Room (MCR) employs design concepts based on today's requirements. We will discuss the ideas used in the design of the MCR and how we feel about the layout, after living with it for the past three years. We will also note how safety concerns have been integrated into the control room layout. Speakers will be Stan Pasky and Greg Banks