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How the three assessment approaches differ
These approaches can use overlapping techniques, but they have different primary objectives. A useful assessment plan makes those objectives explicit before deciding on scope, methods, defender awareness, and reporting.
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| Approach | Primary question | Typical emphasis | Defender involvement |
|---|---|---|---|
| Penetration test | Can a weakness in the agreed scope be exploited? | Technical testing of defined systems, accounts, or applications; evidence of weaknesses and their potential impact. | Coordination and visibility depend on the rules of engagement; the test is constrained by the agreed scope and permitted methods. |
| Red-team exercise | Can a simulated adversary achieve an organizational or mission-related objective, and how does the organization respond? | Adversary behavior in a more operational setting, including the interaction between attack paths and defensive capability. | May be designed to assess defenders under realistic conditions. Specify who knows about the exercise and who can stop it. |
| Purple-team format | What can offensive and defensive teams learn by testing particular adversary behaviors together? | Collaborative, threat-informed testing that links observed behavior to defensive understanding and detection improvement. | Offensive and defensive practitioners share observations and work through the tests together. Purple teaming is an approach, not necessarily a separate department. |
NIST SP 800-115, the technical guide to information security testing and assessment published September 30, 2008, describes a planned process for setting objectives and scope, conducting tests, analyzing results, and developing mitigations. NIST’s glossary describes a red-team exercise as a simulated adversarial attempt against organizational missions or business processes, intended to assess security capability. MITRE ATT&CK resources describe purple teaming as a collaborative way to use adversary behaviors for defensive learning.
Which format should you choose?
Start with the decision you need to make, rather than the label a vendor uses. A security assessment can combine formats, but mixing objectives without stating them makes it harder to interpret results.
- Choose a penetration test when the central question is whether a defined weakness or attack path can be exploited within an agreed technical scope.
- Consider a red-team exercise when you need to evaluate whether defenders can detect, investigate, and respond to a simulated adversary pursuing a meaningful organizational objective.
- Use a purple-team format when offensive and defensive practitioners should jointly observe specific behaviors, understand what monitoring reveals, and improve or validate detections.
These distinctions are decision guidance, not a required NIST taxonomy. A red-team exercise may include technical testing, and purple-team work may use adversary-emulation techniques; the key difference is the main objective and how the defenders participate.
How to use MITRE ATT&CK without treating it as a checklist
ATT&CK provides a shared vocabulary for describing adversary tactics and techniques. Teams can use it to select behaviors for an emulation, connect threat intelligence to test objectives, and explain what an exercise covered. MITRE presents ATT&CK as a common language for red teams to emulate specific threats and plan operations.
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Use it to make the plan more specific, not to claim complete coverage. MITRE’s public adversary-emulation plans are prototypes based on public threat reporting. Public reports may omit how attackers chain techniques or operate hands-on-keyboard, so a published plan is not necessarily a complete recipe for a threat or a universal coverage standard. Tailor selected behaviors to your organization’s threat intelligence, environment, and objective. MITRE also lists resources such as CALDERA, ATT&CK training, and Purple Teaming Fundamentals; these can support learning or planning, but their existence does not establish that a particular exercise is complete or effective.
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For any technical assessment, set the operating boundaries in writing before work starts. Red-team exercises especially need clear rules of engagement because their operational realism can create uncertainty or risk if participants do not know the limits.
- State the business objective. Identify the decision the assessment should inform: for example, validating exploitability, testing response to an adversary objective, or improving observation of selected behaviors.
- Define scope and exclusions. List systems, applications, accounts, environments, and relevant third parties that are in scope, along with anything explicitly excluded. Resolve ownership and dependencies before testing.
- Specify permitted methods and constraints. Agree which techniques are allowed, which are prohibited, what data may be accessed, and how evidence may be collected. Set test windows and any limits on operational impact.
- Document authorization and rules of engagement. Record the authorized activity, scope, points of contact, escalation path, and conditions for suspending or stopping work. Treat these as essential planning controls, not as a claim that one template or legal rule applies everywhere.
- Set stop conditions and emergency contacts. Define what events require a pause, who can call one, and how the testing team will reach organizational responders if there is a safety, availability, privacy, or business concern.
- Agree on data handling and deliverables. Specify how sensitive information and test evidence will be protected, retained, and shared, and what the final report and any validation work should include.
What a useful report should establish
A report should let technical teams reproduce and address issues while giving decision-makers enough context to prioritize action. NIST SP 800-115 covers analyzing findings and developing mitigation strategies, but it does not prescribe a single mandatory report template.
- Objective, scope, and constraints: what the assessment intended to determine, which assets and behaviors were covered, and which methods or conditions limited the work.
- Evidence and affected assets: what was observed or successfully demonstrated, the relevant systems or accounts, and enough detail to support verification without exposing unnecessary sensitive data.
- Impact and likelihood reasoning: how a finding could affect the organization and what assumptions inform its priority. Distinguish demonstrated outcomes from plausible consequences.
- Remediation actions: practical changes tied to the observed issue, with owners and priorities where the organization can assign them.
- Validation plan: how the organization will confirm that fixes work, including a retest or other agreed verification.
For a red-team or purple-team exercise, also record which objectives and behaviors were attempted, what defenders observed or missed, and how escalation and response worked. Translate those observations into concrete improvements rather than treating a successful or unsuccessful exercise as a standalone verdict on security.
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Which NIST guidance applies?
NIST SP 800-115 remains foundational guidance for planning and conducting technical information security tests, analyzing findings, and developing mitigations. It was published September 30, 2008; it is not a 2026 revision, and NIST characterizes it as an overview of techniques, benefits, limitations, and recommendations rather than a comprehensive testing program.
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NIST SP 800-172A Rev. 3, published May 13, 2026, is narrower in purpose: it provides assessment procedures for enhanced security requirements for controlled unclassified information (CUI). NIST describes possible assessment modes as self-assessment, independent third-party assessment, or government-sponsored assessment, with rigor varying according to agency-defined depth and coverage. It is relevant when CUI requirements apply, not a universal commercial penetration-testing standard.
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