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Haven't found any descriptors for ALL the different DATATYPE parameters. Would imagine this as part of a database describing what the datatype is and how it is used and what disciplines are available would be supremely useful… Did find these tidbits… Good overview to describe them all http://paulaubin.com/blog/revit-parameters/ Kind of Parameter Who Creates it Where does it live Appear in Tags Appear in Schedules Description System Parameters Built in Project and Family Yes Yes Built-in to Revit, You cannot change it Shared Parameters User Defined Project and Family Yes Yes Custom Parameter created for the highest portability and flexibility Project Parameters User Defined Project No Yes Custom Parameter accessible to all objects in a Project Family Pa...