Test Priorities Matrix

Guide for prioritizing test scenarios based on risk, criticality, and business impact.

Priority Levels

P0 - Critical (Must Test)

Criteria:

Revenue-impacting functionality
Security-critical paths
Data integrity operations
Regulatory compliance requirements
Previously broken functionality (regression prevention)

Examples:

Payment processing
Authentication/authorization
User data creation/deletion
Financial calculations
GDPR/privacy compliance

Testing Requirements:

Comprehensive coverage at all levels
Both happy and unhappy paths
Edge cases and error scenarios
Performance under load

P1 - High (Should Test)

Criteria:

Core user journeys
Frequently used features
Features with complex logic
Integration points between systems
Features affecting user experience

Examples:

User registration flow
Search functionality
Data import/export
Notification systems
Dashboard displays

Testing Requirements:

Primary happy paths required
Key error scenarios
Critical edge cases
Basic performance validation

P2 - Medium (Nice to Test)

Criteria:

Secondary features
Admin functionality
Reporting features
Configuration options
UI polish and aesthetics

Examples:

Admin settings panels
Report generation
Theme customization
Help documentation
Analytics tracking

Testing Requirements:

Happy path coverage
Basic error handling
Can defer edge cases

P3 - Low (Test if Time Permits)

Criteria:

Rarely used features
Nice-to-have functionality
Cosmetic issues
Non-critical optimizations

Examples:

Advanced preferences
Legacy feature support
Experimental features
Debug utilities

Testing Requirements:

Smoke tests only
Can rely on manual testing
Document known limitations

Risk-Based Priority Adjustments

Increase Priority When:

High user impact (affects >50% of users)
High financial impact (>$10K potential loss)
Security vulnerability potential
Compliance/legal requirements
Customer-reported issues
Complex implementation (>500 LOC)
Multiple system dependencies

Decrease Priority When:

Feature flag protected
Gradual rollout planned
Strong monitoring in place
Easy rollback capability
Low usage metrics
Simple implementation
Well-isolated component

Test Coverage by Priority

Priority	Unit Coverage	Integration Coverage	E2E Coverage
P0	>90%	>80%	All critical paths
P1	>80%	>60%	Main happy paths
P2	>60%	>40%	Smoke tests
P3	Best effort	Best effort	Manual only

Priority Assignment Rules

Start with business impact - What happens if this fails?
Consider probability - How likely is failure?
Factor in detectability - Would we know if it failed?
Account for recoverability - Can we fix it quickly?

Priority Decision Tree

Is it revenue-critical?
├─ YES → P0
└─ NO → Does it affect core user journey?
    ├─ YES → Is it high-risk?
    │   ├─ YES → P0
    │   └─ NO → P1
    └─ NO → Is it frequently used?
        ├─ YES → P1
        └─ NO → Is it customer-facing?
            ├─ YES → P2
            └─ NO → P3

Test Execution Order

Execute P0 tests first (fail fast on critical issues)
Execute P1 tests second (core functionality)
Execute P2 tests if time permits
P3 tests only in full regression cycles

Continuous Adjustment

Review and adjust priorities based on:

Production incident patterns
User feedback and complaints
Usage analytics
Test failure history
Business priority changes