Software Development Lifecycle (SDLC) Audit Procedure

An audit of the SDLC is a systematic review of the processes, controls, and documentation used in developing software. It ensures that systems are developed securely, efficiently, and in compliance with internal policies and external regulations.

Objective of SDLC Audit

To evaluate whether:

• The organization follows structured, secure, and documented SDLC practices.
• Controls are in place to ensure system integrity, confidentiality, availability, and compliance.
• Risks associated with software development are identified and mitigated.

SDLC Audit Procedure

1. Requirement Analysis Phase

🔎 Objectives:

Ensure that business needs are clearly defined, and security/compliance requirements are included.

✅ Audit Procedures:

• Review requirement documents for clarity, completeness, and traceability.
• Confirm stakeholder involvement and sign-offs.
• Check if security , data privacy , and compliance requirements (e.g., GDPR, HIPAA) are included.
• Verify alignment with organizational goals and IT strategy.

2. Planning Phase

🔎 Objectives:

Evaluate project planning effectiveness and risk management strategies.

✅ Audit Procedures:

• Examine project plans including timelines, budget, resources, and milestones.
• Review risk assessments and mitigation plans.
• Assess the choice of SDLC model (Waterfall, Agile, etc.) and its suitability.
• Ensure roles and responsibilities are clearly defined.

3. Design Phase

🔎 Objectives:

Ensure the system design supports functionality, performance, and security.

✅ Audit Procedures:

• Review architectural diagrams and design documents.
• Evaluate integration of security controls (e.g., authentication, encryption).
• Check for input validation, error handling, and logging mechanisms.
• Validate adherence to internal standards or industry frameworks like ISO/IEC 27001.

4. Development/Coding Phase

🔎 Objectives:

Verify that coding follows best practices and includes necessary security measures.

✅ Audit Procedures:

• Perform code reviews or check for peer review processes.
• Review use of secure coding standards (e.g., OWASP Secure Coding Practices).
• Examine access control to source code repositories.
• Confirm usage of version control tools and change management procedures.
• Look for static/dynamic code analysis tools being used.

5. Testing Phase

🔎 Objectives:

Ensure that testing covers functional, performance, and security aspects.

✅ Audit Procedures:

• Review test plans and test cases (unit, integration, system, UAT).
• Confirm execution of penetration testing , vulnerability scanning , and fuzz testing .
• Evaluate defect tracking and resolution process.
• Verify User Acceptance Testing (UAT) results and approvals.
• Ensure regression testing after changes.

6. Deployment Phase

🔎 Objectives:

Ensure controlled and secure release of software into production.

✅ Audit Procedures:

• Review deployment checklist and approval workflows.
• Examine change management and release management procedures.
• Confirm backup and rollback plans are in place.
• Verify separation between development, testing, and production environments.
• Check access controls to production systems.

7. Maintenance & Support Phase

🔎 Objectives:

Ensure ongoing system support, monitoring, and timely patching of vulnerabilities.

✅ Audit Procedures:

• Review incident and problem management logs.
• Evaluate patch management processes.
• Confirm regular performance monitoring and capacity planning.
• Assess post-implementation reviews and lessons learned.
• Verify continued compliance and audit readiness.

📋 Tools and Techniques Used in SDLC Auditing

• Walkthroughs and Interviews
• Document Reviews
• Code Scanning Tools (e.g., SonarQube, Fortify)
• Vulnerability Scanners (e.g., Nessus, OpenVAS)
• Penetration Testing
• Log Analysis Tools
• Configuration Audits
• Checklists and Scorecards

Auditing the SDLC helps organizations ensure that software is developed securely, meets business needs, and complies with relevant laws and standards. A well-audited SDLC reduces risks, enhances trust in software systems, and supports long-term operational efficiency.