Your part in the security system

Give suppliers enough contract and mission context to scope the work.

A supplier cannot scope the work correctly when a flowdown omits the CUI, system boundary, mission consequence, or shared service behind it.

The position

Tell the supplier what the contract actually protects.

A prime can enforce its contract. It should not demand a broad security claim after giving the supplier vague scope or data context.

Security responsibility

The six roles perform different work and hold different authority. These are the facts this role has to supply, receive, and keep current.

Owns: The prime is responsible for clearly passing down the contract’s data, security, mission, and shared-service context.
Produces: Clear data-handling instructions, responsibility boundaries, evidence for shared services, escalation contacts, and feedback on supplier changes.
Receives: Supplier scope and evidence records, provider dependencies, authorized assessment findings, and notices of changes that affect the contract or mission.
Rechecks when: Update the context when program criticality, information sensitivity, contract requirements, shared systems, supplier roles, or known threats change.

In practice

01
Tell the supplier what information and mission the requirement protects so it can scope the work correctly.
02
Reuse evidence for shared services when justified, while showing what each supplier still has to do.
03
Accept a common evidence record where possible instead of imposing another proprietary questionnaire.

Go deeper

Follow the shared Blueprint, examples, analysis, and current work that apply most directly to this part of the system.

Challenge the model

Bring a real or synthetic handoff, conflict, responsibility boundary, or decision this model needs to handle.