Claris CAD 1.0 requires 1 megabyte of ram, Claris CAD 2.0 requires 2 megabytes. If you are running MultiFinder or System 7, you may need to allocate more ram to the application. You do this by selecting the application at the Finder and increasing the application (current) memory size.
Many Claris CAD users have extra or larger monitors, and this will require extra ram. Scanned images pasted or imported into a file can increase the amount of ram that it needs substantially.
See also the record entitled 'RAM Memory Required to Open a New Document.'