How common controls and inheritance in NIST 800-53 reduce the work for each system
Inheritance lets a system rely on controls that a common control provider has implemented, assessed and monitored, so the system does not have to build those controls itself. Under SP 800-53B, a system that inherits a common control from an internal or external provider does not need to implement it, and in general the more controls an organization runs as common controls, the greater the potential savings, because the protection is amortized across many systems. If you own a system on shared infrastructure, your first job is to list which of its SP 800-53 controls the provider already covers and which remain yours. The organization still owns its controls and its risk decision. An implementation partner can help prepare the provider documentation and evidence, but only an independent assessor issues the assessment result.
Every control is designated as system-specific, hybrid or common, and the designation is set during RMF Task S-3 in SP 800-37 Rev. 2, which allocates controls to the system, its elements and its environment of operation. The answer depends on three things: the authorization boundary you draw, which provider actually implements each control, and the impact level of the system, since the baseline under SP 800-53B determines how many controls are in scope to begin with. A control that is common for one system may be hybrid for another if the boundary or the provider's scope differs. Confirm these points with the provider before you write the system security plan, because the designation determines what you must test yourself.
Before relying on an inherited control, ask the provider for its security and privacy plan, its assessment report and its plan of action and milestones for that control. SP 800-37 Rev. 2 says these documents for common controls are made available to inheriting system owners after the accountable authorizing officials review and approve them, so request evidence that has passed that review. Also ask whether the provider's assessment covered the control at the impact level you need, and whether the control has open deficiencies. If your system is a federal system seeking FedRAMP-authorized services, confirm the provider's authorization status and its FedRAMP class in the current FedRAMP rules before you count a control as inherited.
System-specific, hybrid and common: how RMF Task S-3 assigns each control
RMF Task S-3 in SP 800-37 Rev. 2 decides who implements each control and who must answer for it. The three designations set how much of a control a system owner builds, documents and assesses locally, so getting them right determines what the cost and evidence burden actually is.
System-specific controls
A system-specific control is implemented, assessed and monitored entirely by the system owner for that one system. Its implementation details, assessment results and any POA&M items sit in that system's own security and privacy plan. Check that the designation is not applied by default to controls a shared platform already provides, because that duplicates effort and creates conflicting evidence.
Common controls
A common control is implemented by a common control provider and inherited by every system that relies on it. The provider owns its implementation, assessment and POA&Ms, and makes its plans and reports available to inheriting system owners after the accountable authorizing officials approve them. Confirm in writing which controls the provider documents as common before you assume they are covered.
Hybrid controls
A hybrid control is partly inherited and partly implemented locally, so one control can carry two owners. A common control might cover the platform layer while the system owner adds configuration, account or process steps for its own workloads. The system owner must document exactly which part is inherited and which part is theirs, because gaps often appear at that split.
Where the control is implemented
RMF Task S-3 assigns a control by locating its implementation in the system, one of its elements, or the environment of operation. A control that governs a physical data center usually points to the environment, while one that governs a database configuration points to the system. Map each control to a location before assigning a designation, and record the reasoning so an assessor can follow it.
Inputs from the common control list
Task S-3 uses the list of common control providers and inheritable controls as an input, so the designation depends on what the organization has already published. If that list is incomplete or out of date, system owners will either duplicate controls or inherit controls the provider never assessed. Ask the provider for its current inheritable control list and the date it was last reviewed.
How a system inherits a control from a common control provider
This sequence shows how a common control is identified, allocated, approved and handed to an inheriting system, so the system owner can rely on the provider's evidence without repeating the work. Each step names the output that lets the next one begin.
Identify common controls during the Prepare step
At Prepare task P-5, the organization decides which controls will be common across systems, such as physical protection of a shared data center or enterprise identity services. The people responsible for this decision are the organization's senior leaders and risk executives, who record each candidate control and the provider that will own it. The step is complete when the organization holds a list of common controls with a named provider for each one. Ask the provider to confirm in writing which controls it will implement, assess and monitor, because inheritance depends on that commitment.
Publish the list of inheritable controls
The common control provider turns its commitments into a list of controls that other systems may inherit, with enough detail for an owner to judge fit. Each entry should state what the provider implements, where the implementation applies, and what the inheriting system must still supply. The output is a catalog that the organization can share with system owners and that feeds the next step. Confirm that the list is kept current when the provider changes its environment, because an inherited control is only as accurate as the provider's latest documentation.
Allocate controls in Task S-3
During Task S-3 of the RMF categorization and selection work, the system team assigns each control to the system, to its elements, or to the environment of operation. Each control receives one of three designations: system-specific, hybrid or common. The team uses the provider's inheritable list as an input, so a control that the provider already covers is marked common or hybrid rather than duplicated. The output is an allocation table for the system that the system owner and the authorizing official can review.
Review and approve the provider's documentation
Before an inheriting system receives the provider's security and privacy plans, assessment reports and plans of action and milestones, the accountable authorizing officials for the provider review and approve them. This review is the gate that gives the inheriting owner a basis for trust. The output is an approved set of provider documents that the authorizing officials have accepted for release. Ask the provider to show who signed the approval and when, because an inheriting system cannot rely on documents that have not passed this review.
Hand over provider artifacts to the inheriting owner
Once approved, the provider shares the relevant plans, assessment results and open POA&M items with the owner of each inheriting system. The owner receives only the parts that apply to the controls being inherited, along with any deficiencies that could affect the system. The output is a documented record of what was received and on what date. The inheriting owner should confirm that the shared package matches the controls on the allocation table and that any open POA&M items with an impact on the system are recorded in the system's own plan.
Document inherited and remaining controls
The inheriting system's security and privacy plan records each control as inherited from the provider, implemented by the system itself, or shared between the two. For inherited controls, the plan cites the provider's documents and states any conditions the system must meet for the inheritance to hold. For controls the system still implements, the plan describes the implementation and the evidence. The output is a complete system plan with no control left without a named implementer. Verify that every common and hybrid control on the allocation table appears in the plan with a clear statement of responsibility.
Assess and monitor the inherited controls
The system's assessment covers the controls it implements itself and checks that the inherited controls are correctly applied in its environment. The assessor relies on the provider's assessment results for the common portion and tests the system-specific and hybrid parts directly. Any gap found becomes an entry in the system's plan of action and milestones. The output is an assessment report and updated POA&M, and the owners of both the system and the provider should review changes to the provider's controls, since a change at the provider can alter the inheritance.
Inheriting from FedRAMP-authorized services: what carries over and what does not
When a cloud platform already holds a FedRAMP authorization, its package usually covers the controls for the infrastructure it operates: physical and environmental protection in its facilities, the hypervisor and network layer, and many platform-level logging and encryption services. An inheriting system can point to that documentation for those controls, but only for the services and regions named in the authorization. Anything the organization configures on top of the platform, such as account structure, identity policies, key ownership, and workload hardening, remains the system's responsibility.
- Physical and infrastructure controls: The platform's package generally carries the facility and hardware-level controls, so the system cites them rather than rebuilding them.
- Customer-configured controls: Access roles, logging settings, encryption configuration and network rules are typically the customer's to implement and evidence.
- Service and region scope: A control is inheritable only for the services and regions the authorization covers. Services outside that boundary need local implementation.
- Shared responsibility matrices: The provider's responsibility matrix shows who implements each control. Read it control by control instead of assuming full inheritance.
- Continuous monitoring reports: The inheriting system depends on the provider's ongoing reporting to keep inherited controls current.
Confirm each inherited control against the provider's current package and its published responsibility matrix before writing it into your system security plan.
A SaaS or PaaS provider with a FedRAMP package can usually supply documentation for the controls of the service itself: the software development lifecycle, vulnerability management of the platform, tenant isolation, and the provider's own personnel and incident processes. The inheriting system still owns everything about how it uses the service. Its users, their roles, the data it places in the service, the integrations it builds and the configuration options it selects all need local implementation and evidence.
- Service-internal controls: Platform patching, tenant isolation and provider-side logging are often inheritable when the package covers them.
- Tenant configuration: Multi-factor enforcement, role assignments, session timeouts and sharing settings are set by the customer and must be shown in the system's own evidence.
- Data and integrations: Which data enters the service, how it is classified, and how APIs and connectors are secured belong to the system.
- Export and retention: If the system needs logs or records outside the provider, the export path and retention settings are its responsibility.
- Package scope: A SaaS product may be authorized at one impact level while the system is categorized at another, so compare the two before inheriting.
Confirm which of the provider's features and tenant settings fall inside the authorized boundary, and document each configuration choice in the system's own plan.
A system can also inherit controls from an internal common control provider, such as an enterprise identity service, a central logging platform or a corporate facility. Under SP 800-37 Rev. 2, the provider implements, assesses and monitors those controls, documents them in its plans, has them assessed by suitably independent assessors, and produces plans of action and milestones for deficiencies. The provider's plans, assessment reports and POA&Ms are made available to the inheriting system's owners after the accountable authorizing officials review and approve them. The inheriting system is entitled to rely on those approved artifacts, not on informal assurances.
- Approved artifacts: Request the provider's plan, latest assessment report and open POA&Ms, confirmed as approved by its authorizing official.
- Independence of assessment: A provider assessed only by its own team does not give the same inheritance value as one assessed independently.
- Privacy controls: The senior agency official for privacy designates which privacy controls may be common, so check that a privacy control is designated before inheriting it.
- Inheritance statements: The system's plan should name each inherited control, the provider, and the provider's approved document version.
- Local tailoring: Controls that depend on how the system is used, such as account reviews for its own users, stay system-specific.
Confirm that the provider's authorization is current and that each inherited control appears in its approved plan before relying on it.
Why common controls lower the cost of each additional system
SP 800-53B states that the more controls an organization implements as common controls, the greater the potential cost savings, because protection is amortized across many systems. The saving is not a fixed discount. It comes from paying once to implement, assess and monitor a control at the provider level and then letting each inheriting system rely on that work. The first system on a shared platform carries most of the provider's cost, and each later system adds mainly its own system-specific work. Whether that pattern holds for your environment depends on three things: how many systems will sit on the provider, how many of the controls those systems need are truly common rather than hybrid, and how much of the provider's assessment and monitoring the inheriting systems can reuse without re-testing.
Ask prospective providers and implementation partners to show those three numbers in a quote. Request a list of the controls the provider will document as common, with the assessment and monitoring evidence it will hand to each inheriting system owner. Ask which hybrid controls require the system owner to add a provider-supplied component and who maintains that component. Also ask how the provider's plan of action and milestones (POA&M) entries will reach inheriting systems and within what schedule. If the quote does not separate one-time provider work from recurring monitoring, you cannot judge how the cost changes as systems are added.
Several costs do not disappear under inheritance. Each system still needs its own security categorization, its own authorization boundary, and its own system-specific and hybrid controls, such as application access rules, data handling and local logging configuration. Each system still needs an authorizing official's risk decision and an authorization package that cites the inherited controls accurately. Continuous monitoring of the system's own controls continues for as long as the system operates. Confirm with your authorizing official, before the quote is signed, which parts of the package they will accept by reference to the provider's documentation and which they will expect the system team to test directly.
Who is paid for what when a system inherits common controls
This table compares who bears each cost when a system inherits SP 800-53 controls from a common control provider, and whether each cost is one-time or recurring. Read it to see where spending moves when controls are shared, and which costs stay with the system owner regardless of inheritance.
| Cost component | Who is paid | One-time or recurring | What drives it |
|---|---|---|---|
| Provider's control implementation and monitoring | Common control provider, internal platform team or contracted operator | Implementation is one-time, monitoring recurs | Number of controls designated common, platform breadth, and how many systems inherit them |
| Provider's independent assessment | Independent assessor selected and paid by the provider's organization | Recurs on the assessment cycle | Scope of common controls, depth of testing, and how well provider evidence is already organized |
| System owner's hybrid control work | System owner's staff or a contracted implementer | Mostly one-time, with periodic updates | Split of each hybrid control between provider and system, and how clearly responsibilities are documented |
| System-specific control implementation | System owner's staff or a contracted implementer | One-time build, recurring operation | Application complexity, data sensitivity and the number of system-specific controls at the chosen baseline |
| Authorization package preparation | System owner, with support from an implementation partner if engaged | One-time per authorization, refreshed on significant change | Quality of inherited documentation, completeness of the system security plan, and the number of gaps to resolve |
| Implementation partner scoping and evidence preparation | Implementation partner, under a written fixed-scope agreement | One-time for scoping, variable for evidence work | Number of systems, how much evidence exists in usable form, and whether the partner also builds shared controls |
| Internal staff time | Paid through internal payroll, not an external invoice | Recurring throughout the authorization lifecycle | Who owns the inherited control responses, how often provider plans change, and how quickly the owner acts on findings |
Who owns the controls, who prepares the evidence and who assesses them
The common control provider is the individual, group or organization that implements, assesses and monitors the controls other systems inherit. Under SP 800-37 Rev. 2, that provider documents the controls in security and privacy plans, has them assessed by qualified and suitably independent assessors, and produces plans of action and milestones (POA&Ms) for deficiencies. The provider keeps ownership even when a partner does the technical build.
- Control ownership: The provider accepts responsibility for each common control it offers and for its ongoing operation.
- Plans and assessments: It maintains the security and privacy plan content for common controls and arranges independent assessment.
- POA&M management: It tracks deficiencies in common controls and reports remediation status to inheriting owners.
- Sharing with inheritors: After accountable authorizing officials review and approve the documents, it makes plans, assessment reports and POA&Ms available to inheriting system owners.
- Often outsourced: Hosting build, hardening, log pipelines and evidence collection may be delegated to a partner, while the provider keeps accountability and the assessment stays with an independent assessor.
Confirm with your provider which controls it has designated as common, who approved that designation and when the documents were last reviewed.
The system owner is responsible for the controls the system implements itself, and for confirming that the controls it inherits are actually in place for its environment. Designating a control as inherited does not transfer responsibility for the system's risk, and the owner still has to show how each inherited control applies to the system's boundary and configuration.
- Inheritance mapping: The owner records, for each control, whether it is inherited, system-specific or hybrid, using the output of the Task S-3 allocation.
- Gap check against the provider documents: It reviews the provider's plans and assessment results to confirm that the inherited scope covers its system's components.
- System-specific and hybrid controls: It writes and tests the parts of hybrid controls that fall inside its own boundary, such as account reviews or local logging settings.
- Tracking dependencies: It monitors provider POA&M items that could affect its own authorization and requests updates when they change.
- Often outsourced: Writing system-specific implementation statements, configuring local settings and collecting evidence can be delegated to a partner, but the owner signs off on what it states.
Check that every inherited control in your inventory names a specific provider document and version, not a general statement that the provider is compliant.
An implementation partner prepares the systems, controls and evidence that a provider or owner relies on. DeployOpen works in this role: it plans, implements, hardens, documents and supports self-hosted open-source platforms in the client's own cloud accounts, data centers or air-gapped networks, and it prepares the material an assessor will review. DeployOpen does not issue assessment reports, attestations or authorizations, and it does not hold the control ownership described in the other tabs.
- Build and configuration: It deploys and hardens the platform components, documents the configuration and maintains the baseline.
- Evidence preparation: It sets up collection of logs, configuration exports, scan outputs and change records that map to the controls the client has chosen.
- Documentation drafts: It drafts implementation statements and procedures for the client's review and approval.
- Security testing inputs: It runs security testing that produces findings for the client's risk and POA&M process. Findings are inputs to the client's decisions, not determinations.
- Scope boundary: It works to a written scope, and the client decides which controls are common, hybrid or system-specific.
Ask any partner to state in writing which artifacts it prepares and which decisions remain with the client, the independent assessor and the authorizing official.
Where common control inheritance usually breaks down
Inheritance saves effort only while the provider's controls, documentation and assessment stay true for the inheriting system. The failures below share one pattern: the inheriting owner assumes a control is covered when the paperwork, the boundary or the designation has quietly moved.
Inheriting without current assessment
Inheriting a common control is only as strong as the provider's most recent assessment. Under SP 800-37 Rev. 2, the provider's plans, assessment reports and POA&Ms are shared with inheriting system owners after the accountable authorizing officials review and approve them. Before you rely on a control, request the current assessment report and confirm its date, scope and approval. Ask the provider whether any findings affect the control you inherit.
Hybrid control with missing local half
A hybrid control is split: the provider implements part of it and the system owner implements the rest. Teams often document the provider's half and never build their own, such as the local access review, the local log review or the local recovery test. Map each hybrid control to a named local task, owner and evidence item in the system security plan. Then confirm the local half runs and produces records before the assessor arrives.
Boundary drift outside provider coverage
A common control covers only the components and environment the provider describes. When a team adds a new service, region, database or integration outside that description, the control may no longer protect it, even though the paperwork still says it does. Review the authorization boundary each time architecture changes. Confirm with the provider, in writing, which components and environments their controls cover.
Provider POA&Ms never reviewed
Providers produce POA&Ms for deficiencies in their common controls, and those open items carry into every inheriting system. Owners who never read the provider's POA&M inherit known weaknesses without recording them in their own risk picture. Ask for the current POA&M, check each item that touches an inherited control, and log the risk in your own POA&M if the item affects your system. Re-check the list at each provider update.
Privacy controls assumed common
Privacy controls can be designated as common only when the senior agency official for privacy makes that designation. Teams that assume a privacy control is inherited may find nothing was approved, leaving PII processing without an owner. Ask whether the senior agency official for privacy has designated each privacy control as common. Where no designation exists, assign the control as system-specific and record the owner in the plan.
Common control questions buyers ask before inheriting controls
Can a system inherit all of its SP 800-53 controls from one provider?
Usually not. A system can inherit only the controls that the provider has implemented, assessed and documented for the inheriting system's environment, and the rest stay with the system owner. Under SP 800-53B, a system that inherits a common control from another internal or external provider does not need to implement that control itself. The remaining controls, such as those tied to the system's own applications, data flows, users and configuration, remain system-specific or hybrid. Confirm the split control by control against the provider's documentation, because a provider's common control set rarely covers every control in the baseline your system needs.
How do I tell whether a control is common, hybrid or system-specific?
The designation comes from the allocation step in the RMF, where each control is assigned to the system, its elements or the environment of operation and marked as system-specific, hybrid or common. A common control is implemented and assessed entirely by the provider. A hybrid control has parts the provider handles and parts the owner must complete. Under SP 800-37 Rev. 2, this allocation uses the list of common control providers and inheritable controls as an input. Ask the provider for its inheritable control list, then check each inherited control against your own architecture, because a control marked common by the provider may still need local configuration or evidence from your side.
What should I request from a common control provider before inheriting?
Request the artifacts that let your assessor and authorizing official rely on the inherited controls. Under SP 800-37 Rev. 2, the provider's security and privacy plans, assessment reports and plans of action and milestones for common controls are made available to owners of inheriting systems after the accountable authorizing officials review and approve them. Ask for:
- The inheritable control list with the designation for each control
- The security and privacy plan sections covering those controls
- The most recent assessment report and its scope
- The open POA&M items that affect inherited controls
- The agreed responsibilities for any hybrid control
Confirm with the provider how often these are updated and how you will learn of significant changes.
Does a FedRAMP authorization cover all of the SP 800-53 controls I inherit?
No. A FedRAMP authorization shows that a cloud service has been assessed against FedRAMP's requirements, which are based on SP 800-53, but it does not automatically cover every control your system needs. FedRAMP states that its Class B, C and D certifications loosely align with the SP 800-53B low, moderate and high baselines but do not correlate directly, because providers can tailor controls and agencies can combine components with different categorizations. Check the authorized service's control implementation summary for each inherited control, confirm the impact level it was authorized at matches your categorization, and identify which controls depend on your configuration. The FedRAMP certification rules are the next read for the current requirements.
Is inheriting controls cheaper than implementing them alone?
Generally yes, because a common control's cost is shared across every system that inherits it. SP 800-53B notes that the more controls an organization implements as common controls, the greater the potential savings, since protection is amortized across many systems. The savings depend on how many systems actually inherit each control, how much the provider has already documented and assessed, and how much hybrid work remains for your team. Costs that do not disappear include your own assessment of inherited controls, your system-specific documentation, and any configuration you must maintain. Ask any consultant or provider for a quote that separates one-time work from recurring work and shows which controls are inherited, hybrid and system-specific. No cost figure is supplied here, so confirm pricing with each party directly.
What must the system owner still do after inheriting controls?
The owner remains accountable for the system and for every control allocated to it, including inherited controls as they apply to the system. The owner must document which controls are inherited and from whom, complete the hybrid and system-specific controls, and keep the system's security and privacy plan accurate. The owner also monitors whether the provider's controls stay in place, tracks changes that affect inherited controls, and carries relevant POA&M items into its own tracking. The authorizing official still makes the risk decision for the system. Build these duties into your continuous monitoring strategy so that a provider's change does not silently break your authorization basis.
Can my organization set up common controls in-house?
Yes, if your organization has the people and the authority to implement, assess and monitor the controls and to publish the documentation that inheriting systems will rely on. Under SP 800-37 Rev. 2, a common control provider is responsible for implementing, assessing and monitoring its controls, documenting them in plans, having them assessed by qualified, suitably independent assessors, and producing POA&Ms for deficiencies. That independence requirement means the team that runs a control generally cannot be the only team that assesses it. An implementation partner such as DeployOpen can prepare systems, controls and evidence for this work on your self-hosted platforms, but it does not assess controls or issue authorizations. Ask your assessor which assessment independence arrangement they will accept.
What to confirm with your provider and assessor before relying on inheritance
Before your system marks a control as inherited, confirm the date and scope of the provider's security and privacy plan. Ask the common control provider which release of its package it is, when it was last reviewed, and whether the controls you plan to inherit appear in that version. Under SP 800-37 Rev. 2, the plans, assessment reports and POA&Ms for common controls reach inheriting system owners only after the accountable authorizing officials have reviewed and approved them, so ask for proof of that approval, not just the documents. If the package predates a material change to the provider's environment, treat the inherited control as unverified until the provider reassesses it.
Next, confirm who assessed the inherited control and how independent they were. SP 800-37 Rev. 2 expects the common controls to be assessed by qualified, suitably independent assessors. Ask whether the assessor for the provider's controls is the same person or team that assesses your system, and whether they built or operate the controls they are testing. Ask the authorizing official responsible for your system to record that they reviewed the provider's assessment report and accepted it as the basis for inheritance. If that review is missing from your authorization package, the inheritance has no documented decision behind it.
Finally, confirm the boundary of each inherited control. A control can be common for one part of the environment and system-specific or hybrid for another, so write down exactly which components, accounts, locations and tenants the provider's implementation covers. For example, an inherited audit logging control may cover the provider's platform logs but not the application logs your team generates on top of it (illustrative). Check that your RMF Task S-3 allocation matches the provider's list of inheritable controls, and that any part the provider does not cover is assigned back to your system and tracked in your plan of action and milestones.
How to get a system ready to inherit controls
This sequence turns a provider's published control list into a system security plan where every inherited control has a named owner, an approved artifact and a clear remainder for the system's own assessment.
Confirm the provider's inheritable control list
Start by obtaining the common control provider's list of inheritable controls, including the controls it implements, the scope of its authorization and the version of its security plan. The system owner and the provider's security team confirm the list in writing. The step is done when the system owner holds a dated list that names each inheritable control and the authorizing official who approved the provider's plan. Ask the provider which controls are only partly covered, because those become hybrid controls later.
Map the system's controls against the list
Take the system's selected baseline and mark every control as system-specific, hybrid or common, following the allocation approach in the RMF Prepare and Select work. The system's own team reviews each mapping with the provider's documentation in hand, since the provider's plan describes what it covers and what the customer must still do. The output is a control allocation table with a designation and a short reason for each control. Any control the provider does not cover stays system-specific by default.
Collect the approved provider artifacts
Request the provider's security and privacy plan sections for each inherited control, its most recent assessment report and its plan of action and milestones. Under SP 800-37 Rev. 2, these artifacts are shared with system owners only after the accountable authorizing officials review and approve them, so confirm approval status before relying on any document. The step is done when the system owner holds approved copies, with dates and version identifiers, in the authorization package.
Document hybrid and system-specific controls in the system security plan
Write the system security plan so that each inherited control states that it is inherited, names the provider and cites the provider artifact that supports it. Hybrid controls describe the provider's part and the system's part separately, with the responsible party for each. System-specific controls describe the implementation in full. The reviewer should be able to trace every control statement to an owner and to evidence without reading the provider's documents line by line. The step is done when the plan has no control without an implementation statement and designation.
Hand the remaining gaps to the assessment
Compare the provider's open POA&M items and the system's own gaps against the control allocation table, then send the unresolved items to the control assessor with the system security plan and the provider artifacts. Note which items the provider owns and which the system owns, so the assessor tests each control against the party responsible for it. The output is a gap list with owners and a clear record of which inherited controls the system is relying on, which becomes the basis for the assessment plan.
How DeployOpen maps inherited controls and prepares evidence
DeployOpen works on the inheritance question as an implementation task: which controls the platform provider can carry as common controls, and which the system must still implement itself. We prepare the self-hosted platform and its control evidence inside your own infrastructure, while the organization owns its controls and an independent assessor issues any assessment result.
How we scope
- Agree in writing which systems, platforms and environments are in scope for inherited control mapping
- List each candidate common control and record the provider, the inheriting systems and the designation
- Confirm which controls stay system-specific or hybrid, with the owner named for each
- Engagements are fixed-scope, with deliverables and timelines agreed before work starts
How we build
- Configure the self-hosted platform so its common controls are implemented and reproducible in your environment
- Document how each inherited control is met, including the parts the inheriting system still owns
- Test configurations against the SP 800-53A assessment procedures for each control in scope
- Keep the mapping current as platform components, versions and hosting arrangements change
How we hand over
- Deliver the control mapping, control implementation statements and supporting configuration records
- Package the common control evidence the provider must share with inheriting system owners
- List open deficiencies and the remediation items to carry into the plan of action and milestones
- Your authorizing official reviews and approves the provider documentation before any system inherits it
How we support
- Ongoing support, upgrades and continuous testing are available as a retainer after handover
- Retainers can cover updating inheritance mappings when a new system begins to rely on the provider
- Ask any assessor or certification body you engage to confirm the evidence format they accept
- Confirm with your assessor which parts of the inheritance model they will test independently
