Translate shared responsibility into owners, cadence, and evidence outputs
Gridex offered this until 2026-07-25. The description it carried at the time was: “What a CMMC shared responsibility matrix should track across the contractor, MSP, MSSP, CSP, enclave provider, RPO, vCISO, and evidence coordinator.”
Implementation and evidence production can belong to different parties
Shared responsibilities need dependency and handoff fields
Every row needs an expected output and cadence
The contractor retains overall responsibility
Avoid a single RACI letter per control
One NIST requirement can contain several objectives and multiple operating tasks. A provider may configure a system while the contractor approves access, reviews results, and preserves the record. The matrix should be detailed enough to drive evidence requests.
Add evidence fields to the responsibility fields
The minimum useful row explains how the responsibility will be proven.
- Applicable objective or responsibility statement
- Implementer and process operator
- Evidence producer and approved source
- Expected artifact, record, interview owner, or test operator
- Cadence and change trigger
- Client reviewer, qualified reviewer, and escalation authority
Review the matrix when services change
The matrix should be reviewed at onboarding, renewal, scope change, provider change, and assessment preparation. A static matrix can become misleading when service descriptions or architectures change.
Concrete, client-owned operating records
Facts, not verdicts
The matrix documents how work is allocated. It does not remove the contractor’s obligations or predetermine assessment findings.
Frequently asked questions
Is a shared responsibility matrix required in one official format?
No single Gridex format is mandated. The important requirement is to document ESP relationships, services, scope, and responsibilities sufficiently for the program and assessment.
How often should it be reviewed?
At a minimum when providers, services, scope, systems, contracts, or relevant responsibilities change, and during scheduled program and assessment preparation reviews.
Source context
This is reference material, not an offer.
Gridex is a managed operations firm. Managed Voice Operations is the primary growth line and Managed Workflow Operations is the secondary line. There is no dashboard for anyone on the client side to run. The Voice Demo is in pilot as of 2026-08-11. Managed Voice is not yet operating for customers; demo calls are product tests, not customer production. No customer result or tested third-party integration is published. Managed Workflow Operations is the secondary line running today, and it is in validation.