The WIS is the factory system. There are no paper manuals anymore due to the complexity of the cars and the volume of space it would take. If you learn the WIS you will be far ahead. MB does sell a CD for the W202, which is a condensed version fo the WIS. It is fine for most DIYer stuff, but isn't anywhere near as extensive as the WIS. The PN for the CD is P-2700-202-03. MBUSA had them on sale for $49.95 a while back. One caveat - neither the WIS or CD are C36 specific - they are for the model series.