This Compliance Data System (CDS) User's Guide is designed to be the primary source of user documentation regarding CDS. It replaces all documentation dated prior to December 1976, which should be discarded. The guide is organized to be used effectively by several groups of potential readers: Managers and others wishing a basic description of CDS should read Sections 2 and 3, Management Overview and System Applications. Current Users who generally understand CDS will wish to skip to specific sections of interest, particularly Sections 7 and 9, Edit Processing and Retrieval Processing, which reflect recent changes. New Users may wish to read the text in its entirety, at least through Section 9 to obtain a working knowledge of CDS. Those Preparing Input Data should read Section 6, Data Input Preparation. (Portions of this document are not fully legible.)