Each dialog and task can be assigned one security category. Each user can be assigned any number of security categories. For a user to be able to execute a certain dialog or task, s/he must have the identical security category as is on the dialog or task.
Aprogrammer must have the same security category as the dialog before s/he is allowed to access the dialog in ADSC.
TSO option DB.5.6 may be used to get reports listing the security class on each dialog or listing the security classes that users have assigned to them. If you need to assign a security class to a dialog, run the Dialog Security Report first to see what class are available (not currently being used by other dialogs).