Master System Security Plan

Definition
A Master System Security Plan (MSSP) is

"[a]n identification of common security information for 'similar systems' at a given site or facility. The MSSP, which is required for all site-based accreditations, contains the site CONOPS and architecture and includes a listing of all systems covered under the site based accreditation, a description of how the site complies with the requirements of this manual, and a 'wiring diagram' showing external connections."