Key System Schematic Forms Form KSS-1 is for a 4-level system.  All grands are printed under the great grand.  You just fill in the name of the area or department for each, including the total number of master keys anticipated under each grand. Form KSS-2 is used for a grand master key system or for the A grand under a great grand master key.  All master key symbols are preprinted on the form.  You again just fill in the area or department and the number of change keys for each master, including all expansion.  Changes directly under the grand (A1, etc.) are handled in the last box. Form KSS-3 is just like KSS-2, but there are no symbols printed on it.  You use this form as a continuation of KSS-2 to map out the masters under each grand beyond A.  It is also usable to map out changes under each master key if you need to go to that level of detail.