Next: Implementation Design of the ASC Data Model . ... The AXAF Science Center (ASC) is using an ``open architecture'' approach to develop its data analysis environment. The system is a loosely coupled environment consisting of several major applications: visualizer, browser, fitter/modeler, as well as the data analysis tool-box. The ASC Data Model and Interprocess Communications (IPC) provide the data interface between applications and tools. ... Figure: Data analysis environment. ...