Category: FedRAMP Program
Third Party Assessment Organization
Also known as: 3PAO, Third-Party Assessment Organization
Simply put
A 3PAO is an accredited independent firm that tests and evaluates the security controls of cloud service offerings for the Federal Risk and Authorization Management Program (FedRAMP). Its role is to provide an unbiased assessment of whether a cloud provider's security measures are working as intended. A 3PAO performs the assessment; it does not itself grant the authorization to operate, which is a separate government decision.
Formal definition
Within the FedRAMP framework, a Third Party Assessment Organization (3PAO) is an independent entity that assesses the effectiveness of security controls associated with cloud service offerings (CSOs). Under the FedRAMP Security Assessment Framework, a 3PAO is generally required to be accredited (per the evidence, by A2LA) in order to be recognized by FedRAMP. Practitioners should distinguish the assessment activity performed by a 3PAO from the authorization decision, which is made by an authorizing party rather than the 3PAO. Note also that a 3PAO in the FedRAMP context is distinct from a C3PAO used in other assessment programs; the evidence here addresses only the FedRAMP 3PAO role, and readers should verify current accreditation requirements and obligations against official FedRAMP sources, as these may change across program revisions.
Why it matters
The 3PAO function exists to inject independence and technical rigor into the FedRAMP process. A cloud service provider has an inherent incentive to present its security posture favorably, so FedRAMP relies on an accredited, independent Third Party Assessment Organization to test whether the security controls associated with a cloud service offering actually work as intended. Without this independent assessment step, agencies would be forced to take a provider's self-attestation at face value, which would undermine the credibility of the authorization process.
Who it's relevant to
Cloud Service Providers Pursuing FedRAMP
Providers seeking FedRAMP recognition for a cloud service offering generally must engage an accredited 3PAO to independently assess their security controls. Providers should understand that a completed 3PAO assessment supports, but does not by itself produce, an authorization to operate, which remains a separate government decision.
Authorizing Officials and Agency Decision-Makers
Officials who rely on FedRAMP assessment materials use the independent findings produced by a 3PAO as evidence when making an authorization decision. They should treat the 3PAO's work as an assessment of control effectiveness rather than as the authorization itself, and confirm that the assessing organization holds current accreditation recognized by FedRAMP.
Assessment Firms and Auditors
Firms operating as, or aspiring to become, 3PAOs need to understand the accreditation basis for FedRAMP recognition (per the evidence, accreditation by A2LA) and their obligations under the FedRAMP Security Assessment Framework. Because these requirements can change across program revisions, firms should verify current obligations and performance standards against official FedRAMP sources.
Compliance Officers Working Across Programs
Practitioners supporting multiple assessment programs should not conflate a FedRAMP 3PAO with a C3PAO used in other assessment programs; the two operate in distinct contexts. This entry addresses only the FedRAMP 3PAO role, and readers should confirm program-specific terminology and requirements against the applicable official sources.
Inside 3PAO
Third Party Assessment Organization (3PAO)
An independent organization that conducts security assessments of cloud service offerings against FedRAMP requirements, providing an impartial evaluation used to support authorization decisions.
Accreditation Status
3PAOs are generally accredited to demonstrate their competence and independence to perform FedRAMP assessments. Practitioners should verify a given organization's current accreditation status against the FedRAMP PMO's authoritative listing, as accreditation can change.
Security Assessment Role
The 3PAO performs the assessment activities that produce evidence and findings, typically documented in assessment artifacts such as a Security Assessment Plan and Security Assessment Report. This assessment role is distinct from the authorization decision itself.
Independence Requirement
A defining attribute of a 3PAO is organizational independence from the cloud service provider being assessed, intended to preserve the objectivity of assessment results.
Relationship to the FedRAMP PMO
The FedRAMP Program Management Office maintains the FedRAMP program and related requirements under which 3PAOs operate; the 3PAO conducts assessments but does not grant authorizations.
Common questions
Answers to the questions practitioners most commonly ask about 3PAO.
Does a 3PAO's assessment grant a cloud service its FedRAMP authorization?
No. A 3PAO performs the independent assessment and documents findings, but it does not issue the authorization. Assessment and authorization are distinct functions. The authorization decision is made by an authorizing official, through the FedRAMP PMO's process (such as the Joint Authorization Board or an agency ATO), depending on the applicable authorization path. Confusing the assessor's role with the authorizing official's role is a common mistake; the 3PAO produces evidence and a security assessment report, while the authorizing official accepts the risk and grants the authority to operate.
If a 3PAO validated a system under FedRAMP, does that automatically satisfy DoD requirements for handling CUI?
Not necessarily. FedRAMP authorization addresses federal civilian cloud requirements and does not by itself satisfy DoD-specific obligations, which may involve additional requirements under the RMF, DoD impact levels, or contractual clauses. A FedRAMP authorization at a given impact level is not automatically equivalent to a DoD authorization. Readers should confirm the specific DoD requirements applicable to their system and contract against current authoritative sources, because scope boundaries between federal civilian and defense environments differ.
How do I confirm that an assessor is a recognized 3PAO before engaging them?
Verify the organization's current accreditation status through the applicable authoritative source rather than relying on a vendor's self-description. Accreditation is maintained by the responsible accreditation body, and an organization's standing can change over time. Confirm that the accreditation is active as of your engagement date and covers the type of assessment you require.
What deliverables should I expect a 3PAO to produce from an assessment?
In most implementations, a 3PAO develops a security assessment plan describing the scope and testing approach, executes the assessment, and documents results in a security assessment report along with supporting artifacts such as identified findings. These deliverables inform the authorizing official's risk decision but do not constitute the authorization itself. Confirm the exact required deliverables and formats against the current applicable program guidance, as these can vary by authorization path and revision.
Does a successful 3PAO assessment mean my system stays authorized indefinitely?
No. An authorization based on the assessment is time-bound and subject to continuous monitoring. A point-in-time assessment reflects the system's state during that assessment window and does not guarantee ongoing compliance. Systems generally remain subject to periodic reassessment and continuous monitoring obligations, and an authorization can be affected by changes in the system, its environment, or its risk posture.
Does passing a 3PAO assessment mean my system is secure?
Not on its own. Compliance demonstrated through an assessment is not the same as security. A 3PAO assessment evaluates whether specified controls are implemented and operating as documented against the applicable baseline, but meeting those requirements does not eliminate risk or guarantee protection against all threats. Treat the assessment as one input into an ongoing risk management process rather than as proof of a secure system.
Common misconceptions
A 3PAO grants or issues the authorization for a cloud service.
A 3PAO performs the assessment and produces findings, but the authorization decision is made by an authorizing official or authorizing body, not the assessor. Assessment and authorization are distinct steps that should not be conflated.
A favorable 3PAO assessment means a system is secure or that compliance is permanent.
An assessment reflects the system's state against applicable requirements at the time of evaluation. Compliance is not the same as security, and any resulting authorization is time-bound and subject to continuous monitoring rather than permanent.
A FedRAMP 3PAO assessment automatically satisfies DoD or other agency requirements.
FedRAMP assessment and authorization do not automatically satisfy DoD-specific requirements, which may impose additional conditions. Readers should confirm applicable agency requirements against current official sources.
Best practices
Verify a 3PAO's current accreditation status against the FedRAMP PMO's authoritative listing before engaging or relying on its work, since accreditation can change over time.
Confirm the independence of the 3PAO from the cloud service provider being assessed to preserve the objectivity of assessment results.
Treat the 3PAO assessment as input to, not a substitute for, the authorization decision made by the responsible authorizing official.
Do not assume a FedRAMP assessment satisfies DoD or other agency-specific requirements; verify additional obligations against current authoritative sources.
Remember that any authorization supported by a 3PAO assessment is time-bound and requires ongoing continuous monitoring rather than a one-time effort.
Retain and review 3PAO assessment artifacts, such as the Security Assessment Plan and Security Assessment Report, and confirm current formats and requirements against official FedRAMP guidance.