Supporting Design Information (SDI) is historically what is considered ‘design bases’ information. It is the engineering information used to translate system, structure, or component related SSCSs into physical systems, structures, or components. SDIs might be prepared by architect/engineers, component vendors or other sub-contractors.

In the past, this design bases information was difficult to manage because source documentation was often not available. The new CM taxonomy accommodates this and the management of proprietary information by providing mechanisms to reflect critical calculation results and other numbers without necessarily requiring the supporting calculation or information.