Defect Management
A systematic approach to identifying, documenting, tracking, and resolving software defects throughout the development lifecycle.
What is Defect Management?
Defect management is the systematic process of identifying, documenting, tracking, and resolving software defects from discovery through closure. It ensures that all issues are properly categorized by severity and priority, assigned to the appropriate team members, and tracked through a defined lifecycle until resolution and verification.
Defect Lifecycle and Severity
| Stage / Level | Description | Classification |
|---|---|---|
|
Open
|
Defect has been identified and documented. Awaiting assignment to a developer or team for investigation and resolution. | LIFECYCLE |
|
In Progress
|
Developer is actively working on understanding the root cause and implementing a fix. May involve code changes, testing, and debugging. | LIFECYCLE |
|
Fixed
|
Code changes have been implemented and committed. The defect is ready for QA verification but has not been tested yet. | LIFECYCLE |
|
Verified
|
QA has confirmed the fix resolves the issue without introducing new problems. The defect is approved for closure. | LIFECYCLE |
|
Closed
|
Defect has been resolved, verified, and deployed to production. No further action required unless the issue reoccurs. | LIFECYCLE |
|
Critical
|
System crash, data loss, or security vulnerability. Blocks core functionality and requires immediate attention. | SEVERITY |
|
Major
|
Significant feature malfunction with no workaround. Impacts key user workflows but does not prevent system use. | SEVERITY |
|
Minor
|
Issue affects non-critical functionality. A workaround exists, and the defect does not significantly impact user experience. | SEVERITY |
|
Trivial
|
Cosmetic issues, minor UI glitches, or suggestions for improvement. Does not affect functionality or user tasks. | SEVERITY |
Defect Management Process
Defect Identification
Testers discover defects during test execution. Each defect is documented with steps to reproduce, expected vs actual behavior, and environment details.
Classification and Prioritization
Defects are categorized by severity (Critical, Major, Minor, Trivial) and priority based on business impact and urgency.
Assignment and Resolution
Defects are assigned to developers who investigate root causes, implement fixes, and update the defect status to Fixed.
Verification
QA retests the fixed defect to confirm it no longer occurs and that the fix has not introduced new issues (regression testing).
Closure and Reporting
Verified defects are closed. Metrics such as defect density, resolution time, and escape rate are tracked for continuous improvement.
Key Defect Metrics
Defect Density
Measures the number of defects relative to the size of the software, typically expressed as defects per thousand lines of code (KLOC) or defects per function point.
Defect Age
Tracks how long defects remain open from identification to closure. Longer age indicates bottlenecks in resolution or prioritization issues.
Defect Escape Rate
Percentage of defects found in production versus those found during testing. Lower rates indicate more effective testing processes.
Resolution Time
Average time required to fix and verify defects. Tracks development efficiency and helps forecast release readiness.
Standards and Best Practices
ISTQB Foundation
This defect management framework follows ISTQB (International Software Testing Qualifications Board) guidelines for defect lifecycle management, severity classification, and metrics tracking. Our certified QA engineers apply industry-standard practices to ensure consistent, high-quality defect resolution processes.
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