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10 PCI Assessment

A PCI DSS assessment is the structured process used to determine whether an organization’s payment environment satisfies applicable PCI DSS requirements.

It brings together everything covered so far:

PCI Scope
CDE
Network Segmentation
Access Control
Vulnerability Management
Logging
Secure Development
Penetration Testing
Assessment

The assessment does not simply ask:

Do we have security controls?

It asks:

Which PCI requirements apply?
Which controls satisfy them?
Are those controls implemented?
Are they operating?
Can we prove it?
Are there gaps?
Have gaps been remediated?

The central question is:

Can the organization demonstrate, with reliable evidence, that applicable PCI DSS requirements are implemented and operating across the complete in-scope environment?

By the end of this lesson, you will be able to:

  • Explain the purpose of a PCI DSS assessment.

  • Understand different assessment and validation models.

  • Define PCI assessment scope.

  • Build a Requirement Applicability Matrix.

  • Identify control owners.

  • Prepare an evidence request list.

  • Understand assessment evidence.

  • Conduct interviews and walkthroughs.

  • Perform technical validation.

  • Build testing populations.

  • Select and test samples.

  • Identify assessment findings.

  • Classify compliance gaps.

  • Manage remediation.

  • Perform retesting.

  • Understand compensating controls.

  • Understand the Customized Approach.

  • Coordinate with QSAs and internal assessors.

  • Build a PCI assessment dashboard.

  • Determine readiness for compliance validation.

A PCI DSS assessment evaluates whether applicable PCI DSS requirements have been implemented correctly.

A practical assessment model:

Requirement
Control
Implementation
Evidence
Testing
Conclusion

A weak assessment might look like:

Policy Exists
Requirement Marked Compliant

A stronger assessment asks:

Policy
+
Configuration
+
Operation
+
Evidence
+
Testing

The assessment should determine whether controls are:

Defined
Implemented
Operating
Evidence Supported
Sustainable

Before assessment begins, collect:

PCI Scope Statement
CDE Asset Inventory
Network Diagram
Cardholder Data Flow
Service Provider Register
Responsibility Matrix
Control Inventory
Policies
Technical Evidence

The organization should understand which validation approach applies.

Potential mechanisms include:

Self-Assessment Questionnaire
Report on Compliance
Attestation of Compliance

depending on merchant/service-provider classification, payment-brand rules, acquiring relationships, and applicable validation requirements.

A:

SAQ

is used by eligible organizations to perform structured self-assessment.

Different SAQs exist for different payment environments.

A:

ROC

is a detailed assessment report commonly used for organizations requiring a formal assessment at that level.

An:

AOC

records the organization’s attestation related to the applicable PCI DSS assessment.

A:

QSA

is a qualified PCI DSS assessor associated with a Qualified Security Assessor Company.

QSAs may perform formal assessments where required.

Some organizations also maintain qualified internal assessment capability.

However, internal readiness work should still use the same discipline:

Requirement
Evidence
Testing
Conclusion

A mature PCI assessment lifecycle looks like:

Planning
Scope Confirmation
Requirement Applicability
Evidence Collection
Walkthroughs
Testing
Findings
Remediation
Retesting
Final Validation

Create:

01 PCI Assessment Plan

Include:

Field Details
Assessment Type
Assessment Period
PCI Scope
Assessor
Internal Owner
Target Completion
Validation Method

Identify:

Executive Sponsor
PCI Program Owner
GRC Lead
Technical Owners
Evidence Owners
Assessor

Create:

02 PCI Assessment RACI

Use:

Activity GRC Security Engineering System Owner Assessor

Do not start testing requirements before confirming scope.

Use:

Payment Channels
CHD Flow
CDE
Connected Systems
Security-Impacting Systems
People
Processes
Third Parties

Ask:

Has architecture changed?
Any new payment channels?
Any new providers?
Any new cloud accounts?
Any new applications?
Any new data stores?
Any new network connections?

Reconcile:

Asset Inventory
Network Diagram
Data Flow
Actual Environment

Documentation shows:

40 CDE Assets

cloud inventory shows:

46

Gap:

6 Undocumented Assets

Assessment should pause or expand scope until understood.

Create:

03 PCI Assessment Scope Validation Register

Use:

Area Expected Actual Status Action

20. Phase 2 — Determine Requirement Applicability

Section titled “20. Phase 2 — Determine Requirement Applicability”

Not every environment implements every requirement in exactly the same way.

Create:

04 PCI Requirement Applicability Matrix

Use:

Requirement Applicable Control Owner Rationale

Do not mark:

Not Applicable

simply because:

We Don't Use That Control

There must be a valid architectural or business reason.

If organization has no wireless systems within or connected to the relevant environment:

Wireless Controls
→ Applicability Evaluated

Document the reasoning and evidence.

If organization never stores PAN:

Stored Account Data Controls

may have different applicability than an environment maintaining payment databases.

But the absence of storage must be validated.

The Defined Approach uses the control requirements explicitly described by PCI DSS.

Model:

PCI Requirement
Defined Control
Implementation
Testing

Where permitted, an organization may use a Customized Approach.

Model:

Security Objective
Customized Control
Targeted Risk Analysis
Testing
Evidence

It is not:

We Don't Want to Follow
the Defined Requirement

It requires strong documentation and validation.

Include:

Security Objective
Control Design
Risk Analysis
Testing Method
Evidence
Validation

Map each applicable requirement to an enterprise control.

Create:

05 PCI Control Mapping

Use:

PCI Requirement Enterprise Control Owner Evidence

Example:

Privileged MFA

may support:

PCI
SOC 2
ISO 27001

Avoid unnecessary duplication.

Every PCI control should have:

Control Owner

responsible for the control design and operation.

Evidence collection may belong to:

Control Operator
GRC
System Administrator
Security Analyst

depending on the process.

32. Phase 4 — Build Evidence Request List

Section titled “32. Phase 4 — Build Evidence Request List”

Create:

06 PCI Evidence Request List

Use:

Request ID Requirement Evidence Owner Due

Examples:

Network Diagrams
Data Flow Diagrams
Firewall Rules
IAM Reports
MFA Coverage
Access Reviews
Vulnerability Scans
ASV Reports
Penetration Tests
Log Reviews
Training Records
Policies
Provider AOCs

Strong:

IAM Export

Weak:

Manually Typed User List

when the identity platform is available.

Ask:

Relevant?
Reliable?
Complete?
Correct Period?
Traceable?
Current?

Use:

Requested
Received
Under Review
Accepted
Rejected
Missing

Create:

07 PCI Evidence Tracker

Use:

Request Owner Received Quality Status

Requirement:

Quarterly Access Review

Evidence:

Screenshot of Current Users

Missing:

Reviewer
Review Date
Decision
Removed Access

Status:

Rejected

Walkthroughs help the assessor understand how a control operates.

Example:

User Access Request
Approval
Provisioning
MFA
Access Review

May include:

GRC
Control Owner
Operator
Security
Engineer
Assessor

Create:

08 PCI Control Walkthrough Schedule

Use:

Control Owner Date Assessor Status

Ask:

What triggers the control?
Who performs it?
How often?
Which system?
What evidence is created?
What happens if it fails?

Weak:

"This is how we normally do it."

Strong:

Real Ticket
Real Approval
Real Provisioning

Many controls operate multiple times.

Examples:

All New Users
All Terminations
All Firewall Changes
All Production Changes
All Critical Vulnerabilities
All Log Reviews

A sample is valid only if the population is complete.

Example:

HR Terminations:
80

IAM termination list:

76

Difference:

4

Investigate before sampling.

Create:

09 PCI Control Population Register

Use:

Control Population Source Period Count

Use authoritative sources such as:

HR
IAM
Ticketing
CI/CD
Vulnerability Scanner
SIEM

Document:

System
Date Range
Filter
Query
Record Count

The assessor may select samples.

Example:

Population:
500 Production Changes
Sample:
30

Each sample should be tested consistently.

Create:

10 PCI Control Testing Workbook

Use:

Control Population Sample Test Result Conclusion

Verify:

Request
Approval
Correct Role
Provisioning
MFA

Verify:

Termination Date
Disablement Date
Privileged Access Removal

Verify:

Request
Business Need
Approval
Implementation
Validation

Verify:

Finding
Severity
Due Date
Remediation
Retest

Verify:

Required Review
Reviewer
Date
Findings
Follow-Up

Verify:

Scope
Tester
Methodology
Findings
Remediation
Retest

An assessor may directly inspect technical controls.

Examples:

Firewall Configuration
MFA Settings
Encryption
Logging
Network Segmentation
System Hardening

Example:

Requirement:

Administrative Access Restricted

Assessor verifies:

Firewall Rule
Security Group
Route
Authentication

Evidence:

Screenshot / Export

Observation:

Assessor Watches
the Configuration Live

Both can support assessment.

Interviews can confirm whether personnel understand:

Roles
Security Responsibilities
Incident Procedures
Payment Data Handling

A professional assessment may combine:

Examine
Observe
Interview
Test

Review:

Policies
Configurations
Reports
Records

Watch:

Physical Controls
Operational Process
System Configuration

Confirm:

Knowledge
Ownership
Process

Validate:

Control Operation
Security Enforcement
Sample Evidence

When evidence does not meet the requirement, document a finding.

Create:

11 PCI Assessment Finding Register

Use:

Finding Requirement Condition Severity Owner

Use categories such as:

Scope
Design
Implementation
Operating Effectiveness
Evidence
Technical Configuration
Third Party

Example:

No Process Exists
for Quarterly Access Review

Policy requires:

MFA

but:

2 Admin Accounts
Do Not Have MFA

Control is defined:

Quarterly Review

but:

Q3 Review Missing

Control owner states:

Review Was Completed

but:

No Reliable Evidence

A payment database exists but is:

Missing From CDE Inventory

Example:

Firewall Allows
0.0.0.0/0
to Admin Port

Example:

Payment Provider
Has No Current PCI AOC

Possible organizational severity:

Critical
High
Medium
Low

Assessment conclusion should still align with the exact PCI requirement status.

Requirement:

Strong Authentication

Condition:

2 / 45 Administrators
Without MFA

Classification:

Implementation / Operating Gap

Expected:

Passing Quarterly ASV Scan

Actual:

Q2 Scan Failed
No Passing Rescan

Classification:

Operating Gap

Expected:

Required Log Retention

Actual:

Database Logs Retained 60 Days

Classification:

Configuration / Operating Gap

Expected:

Annual Penetration Test

Actual:

Last Completed 18 Months Ago

Classification:

Operating Gap

Do not stop at:

Team Forgot

Identify systemic causes.

Example:

Missed Quarterly Review
No Compliance Calendar
No Reminder
No Escalation

Root cause:

Recurring PCI controls are not centrally scheduled and monitored.

Create:

12 PCI Finding Root Cause Register

Use:

Finding Immediate Cause Root Cause Corrective Action

Correction:

Fix Current Problem

Corrective action:

Prevent Recurrence

Finding:

Admin Without MFA

Correction:

Enable MFA

Corrective action:

Automated MFA Coverage Monitoring

Create:

13 PCI Remediation Tracker

Use:

Finding Action Owner Target Status Retest

Prioritize based on:

PCI Requirement
Security Risk
CDE Exposure
Customer Impact
Assessment Timeline

Examples:

Stored SAD
Unauthenticated CDE Access
Internet-Exposed Admin Interface
Segmentation Failure
Critical Vulnerability

require urgent action.

Do not close a finding because:

Owner Says Fixed

Retest.

Finding
Remediation
Retest
Pass / Fail

Create:

14 PCI Assessment Retest Register

Use:

Finding Fix Date Retest Date Result Reviewer

If:

Fail

then:

Finding Remains Open

Example:

10 Systems Affected
9 Fixed
1 Not Fixed

Conclusion:

Open

Where a specific PCI requirement cannot be met as written and compensating controls are permitted under applicable PCI DSS conditions, the organization must demonstrate appropriate compensating controls.

A compensating control is not simply:

Alternative Technology

It needs to address the intent and rigor of the original requirement.

Capture:

Constraint
Original Requirement
Risk
Compensating Control
Validation
Maintenance

Legacy system cannot support a specific technical control.

Potential compensating measures:

Network Isolation
Restricted Access
Enhanced Monitoring
Additional Authentication Layer

subject to assessor validation and PCI conditions.

Review providers supporting the payment environment.

Create:

15 PCI Third-Party Assurance Review

Check:

Provider
Service
PCI Responsibility
AOC
Assessment Period
Service Scope

Do not only check:

Vendor Has AOC

Check whether:

Correct Provider?
Correct Service?
Current Period?
Relevant Scope?

Example:

Cloud Provider
→ Physical Security
Merchant
→ Cloud IAM
Merchant
→ Security Groups
Merchant
→ Payment Application

97. Phase 15 — Assessment Status Dashboard

Section titled “97. Phase 15 — Assessment Status Dashboard”

Create:

16 PCI Assessment Status Dashboard

Track:

Metric Target
Requirements Assessed 100%
Evidence Accepted 100%
High Findings Open 0
Retests Completed 100%
Scope Validated 100%
Provider Assurance Current 100%

Use:

Not Started
In Progress
Evidence Pending
Testing
Remediation
Retesting
Complete

Use:

In Place
Not in Place
Not Applicable
Not Tested

according to the assessment model and applicable reporting format.

A single control owner should not casually declare:

PCI Compliant

The formal compliance outcome depends on the complete applicable assessment and validation process.

101. Phase 16 — Assessment Readiness Review

Section titled “101. Phase 16 — Assessment Readiness Review”

Before formal assessment, perform readiness.

Ask:

Is Scope Stable?
Are Controls Operating?
Is Evidence Complete?
Are Required Scans Passing?
Is Pen Testing Current?
Are High Findings Closed?
Are Providers Current?

102. Build PCI Assessment Readiness Checklist

Section titled “102. Build PCI Assessment Readiness Checklist”

Create:

17 PCI Assessment Readiness Checklist
  • PCI scope statement current.

  • CDE asset inventory current.

  • network diagram current.

  • CHD data flow current.

  • third parties identified.

  • segmentation validated.

  • applicability matrix complete.

  • controls mapped.

  • control owners assigned.

  • Customized Approach items documented where used.

  • evidence request list complete.

  • evidence received.

  • evidence quality validated.

  • missing evidence escalated.

  • populations validated.

  • user inventory current.

  • MFA coverage complete.

  • access reviews completed.

  • termination testing completed.

  • privileged access current.

  • scan coverage complete.

  • ASV results current.

  • critical findings within SLA.

  • unsupported systems addressed.

  • retesting completed.

  • CDE logging coverage complete.

  • log reviews current.

  • retention meets requirements.

  • time synchronization validated.

  • critical events monitored.

  • SDLC controls operating.

  • code review evidence available.

  • application security testing current.

  • production changes approved.

  • penetration test current.

  • segmentation test current.

  • critical findings remediated.

  • retesting completed.

  • critical provider AOCs current.

  • responsibilities documented.

  • provider exceptions resolved.

  • policies current.

  • training current.

  • roles documented.

  • incident response current.

  • PCI risk assessments current.

Track:

Open Critical
Open High
Open Medium
Open Low
Past Due
Retest Pending

Example:

High PCI findings
remaining open
at assessment start

Target:

0

Example:

Applicable PCI controls
without accepted evidence

Example:

Unknown systems
with CDE connectivity

Example:

Critical payment providers
without current PCI assurance

108. Practical Activity — Build Assessment Plan

Section titled “108. Practical Activity — Build Assessment Plan”

Use fictional organization:

CloudShop

Target assessment:

PCI DSS v4.x

Environment:

E-Commerce
Cloud
Payment Processor
Tokenization
Kubernetes

Define:

Scope
Owners
Timeline
Assessment Method

109. Practical Activity — Build Applicability Matrix

Section titled “109. Practical Activity — Build Applicability Matrix”

Review requirement areas:

01 Network Security
02 Secure Configuration
03 Stored Account Data
04 Transmission
05 Malware Protection
06 Secure Development
07 Access Control
08 Authentication
09 Physical Security
10 Logging
11 Security Testing
12 Governance

For each determine:

Applicable?
Owner?
Evidence?

110. Practical Activity — Build Evidence Request List

Section titled “110. Practical Activity — Build Evidence Request List”

Create at least 30 requests across:

Network
IAM
Vulnerability
Logging
Development
Testing
Governance

111. Practical Activity — Access Control Testing

Section titled “111. Practical Activity — Access Control Testing”

Population:

70 CDE Users

Sample:

25

Results:

23 Pass
1 Missing Approval
1 Missing MFA

Document findings.

112. Practical Activity — Vulnerability Assessment

Section titled “112. Practical Activity — Vulnerability Assessment”

Population:

40 Critical/High Findings

Results:

35 Closed Within SLA
3 Overdue
2 Approved Exceptions

Determine:

Compliance Concern
Risk
Follow-Up

Expected:

4 Required Scan Periods

Evidence:

Q1 Pass
Q2 Pass
Q3 Fail
No Passing Q3 Rescan
Q4 Pass

Document the assessment issue.

114. Practical Activity — Logging Review

Section titled “114. Practical Activity — Logging Review”

CDE systems:

50

Sending logs:

48

Retention:

Most:
12 Months
2 Databases:
60 Days

Identify findings.

115. Practical Activity — Penetration Testing Review

Section titled “115. Practical Activity — Penetration Testing Review”

Annual pen test exists.

But:

3 Critical Findings

results:

2 Retested Closed
1 No Retest

Determine readiness.

116. Practical Activity — Segmentation Review

Section titled “116. Practical Activity — Segmentation Review”

Corporate network is declared:

Out of PCI Scope

Testing shows:

Developer Subnet
Payment Database

Determine:

Finding
Scope Impact
Immediate Action

117. Practical Activity — Provider Assurance

Section titled “117. Practical Activity — Provider Assurance”

Payment gateway AOC:

Current

Cloud provider AOC:

Current

Tokenization provider:

Expired 8 Months Ago

Document:

Third-Party Assurance Gap

118. Practical Activity — Build Assessment Summary

Section titled “118. Practical Activity — Build Assessment Summary”

Create an executive summary answering:

Is Scope Accurate?
Are Requirements Covered?
Are Controls Operating?
Are Evidence Gaps Present?
Are Material Findings Open?
Is Organization Ready?

Suppose CloudShop has:

Requirements Reviewed:
100%
Evidence Complete:
92%
High Findings:
5
Critical Findings:
1
Failed Segmentation:
1
Missing ASV Passing Result:
1

Recommended conclusion:

NOT READY
FOR FINAL PCI VALIDATION

until material gaps are remediated and retested.

Mistake 1 — Start With Requirement Checklist

Section titled “Mistake 1 — Start With Requirement Checklist”

Scope is never validated.

No operational testing occurs.

Mistake 3 — Evidence Collected Only During Audit

Section titled “Mistake 3 — Evidence Collected Only During Audit”

Historical control operation cannot be demonstrated.

Samples become unreliable.

Mistake 5 — “Not Applicable” Used Without Rationale

Section titled “Mistake 5 — “Not Applicable” Used Without Rationale”

Requirements are avoided rather than assessed.

Shared responsibility is incomplete.

No passing rescan exists.

Mistake 8 — Pen Test Exists but Findings Remain Open

Section titled “Mistake 8 — Pen Test Exists but Findings Remain Open”

Testing becomes a documentation exercise.

Mistake 9 — Segmentation Failure Ignored

Section titled “Mistake 9 — Segmentation Failure Ignored”

PCI scope remains incorrect.

Mistake 10 — Findings Closed Without Retest

Section titled “Mistake 10 — Findings Closed Without Retest”

Remediation is assumed.

PCI Checklist
Yes / No
Submit
Scope
Requirement Applicability
Enterprise Controls
Evidence
Population
Testing
Technical Validation
Findings
Root Cause
Remediation
Retesting
Formal Validation

A GRC professional supporting a PCI assessment may:

  • Coordinate the PCI assessment plan.

  • validate scope.

  • maintain requirement applicability.

  • maintain PCI control mappings.

  • assign evidence owners.

  • coordinate evidence requests.

  • validate evidence quality.

  • coordinate walkthroughs.

  • build populations.

  • support sample testing.

  • track assessment findings.

  • perform root-cause coordination.

  • maintain remediation trackers.

  • coordinate retesting.

  • review third-party assurance.

  • maintain readiness dashboards.

  • coordinate assessor requests.

  • support final assessment documentation.

GRC connects:

Executive Management
Payment Teams
Security
IAM
Network
Cloud
Engineering
DevOps
SOC
Third Parties
Internal Audit
QSA / Assessors
Assessment Starts
Evidence Collection Starts
Scope
Controls
Evidence Repository
Testing
Findings
Remediation
Retesting
Evidence Automation
Control Monitoring
Scope Change Management
Real-Time Control Validation
Dynamic Scope
Automated Evidence
Continuous Risk Assessment

For every PCI requirement ask:

Does it apply?
What control satisfies it?
Who owns that control?
How does it operate?
How often?
What population exists?
What evidence proves operation?
Can we independently test it?
Are there exceptions?
Why did those exceptions occur?
Were they remediated?
Was remediation retested?

For every:

Not Applicable

ask:

What evidence proves
it truly does not apply?

For every:

Compliant

ask:

What evidence and testing
support that conclusion?

That is the mindset of a professional PCI assessment.

  • PCI assessment begins with accurate scope.

  • Requirement applicability should be documented and defensible.

  • Controls should map clearly to applicable PCI requirements.

  • Evidence should be authoritative, complete, current, and traceable.

  • Walkthroughs help validate how controls actually operate.

  • Control populations should be complete before sampling.

  • Assessment methods may include examination, observation, interview, and testing.

  • Findings can arise from design, implementation, operation, evidence, scope, technology, or third parties.

  • Correction and corrective action are different.

  • Findings should be remediated and retested before closure.

  • Compensating controls and Customized Approaches require documented rigor.

  • Third-party assurance must be reviewed in the context of shared responsibilities.

  • Readiness should be determined before formal PCI validation begins.

  • GRC coordinates scope, controls, evidence, assessment activities, findings, remediation, and assessor interaction.

Before continuing, make sure you can answer:

  1. What is the purpose of a PCI assessment?

  2. Why must scope be validated before testing?

  3. What is an SAQ?

  4. What is a ROC?

  5. What is an AOC?

  6. What is the role of a QSA?

  7. What is a Requirement Applicability Matrix?

  8. What is the Defined Approach?

  9. What is the Customized Approach?

  10. Why should evidence be authoritative?

  11. What is a control walkthrough?

  12. What is a control population?

  13. Why must populations be complete?

  14. What assessment methods can be used?

  15. What is a design gap?

  16. What is an operating gap?

  17. What is an evidence gap?

  18. Why should findings undergo root-cause analysis?

  19. Why should remediation be retested?

  20. What role does GRC play in PCI assessment?

➡️ Next: 11 — PCI Certification Process

In the final lesson of the PCI DSS module, you will move from assessment execution into the formal validation, attestation, reporting, submission, and ongoing compliance lifecycle.

You will work through:

Assessment Complete
Requirement Status
Remediation Closure
ROC / SAQ
AOC
Internal Approval
Submission
Acquirer / Payment Brand Requirements
Compliance Validation
Ongoing PCI Maintenance

You will also build practical artifacts including a PCI Certification & Validation Plan, Assessment Deliverables Register, ROC/SAQ Readiness Checklist, AOC Review Checklist, Compliance Submission Tracker, Outstanding Conditions Register, Annual PCI Compliance Calendar, and Continuous Compliance Dashboard.