C.  When is it required?

A SSDD is required for all competitively negotiated acquisitions.  This means Lowest Price Technically Acceptable (LPTA), Performance Price Tradeoff (PPT), and Full Tradeoff negotiated acquisitions.  If the source selection uses the Simplified Source Selection Report (SSSR) as prescribed in MP5315.308, paragraph 7.11, the SSDD is contained in Section IV of the SSSR.  Otherwise, it is a separate document, but is nonetheless mandatory (FAR 15.308).