Change Collision Management — Avoiding Conflicting Changes

Headline: Two Changes, Same Service, Same Time — How to Manage the Chaos of Change Collisions

What Is Change Collision?

Change collision occurs when two or more changes are scheduled to execute against the same service within overlapping time windows. If both proceed, their combined execution creates ambiguity.

The problem: If Change A depends on a state that Change B modified, rolling back Change B first might break Change A's rollback path.

The Risks of Collisions

Managing Collisions

1. Set Collision Rules Based on Service Criticality

Service criticality tiers:

2. Use Risk Multipliers for Concurrent Changes

When changes overlap, apply risk multipliers:

3. Apply Combined Risk Scoring

Calculate combined risk:

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Combined Risk = (Change A Risk + Change B Risk) × Concurrent Change Multiplier

4. Escalate High-Risk Collisions to CAB

Set thresholds:

Implementing Collision Detection

Technical requirements:

1. Change scheduling system
2. Service mapping
3. Time window overlap detection
4. Risk scoring
5. Automated alerts

Process requirements:

1. Change scheduling requirements
2. Collision review procedures
3. Escalation paths
4. Exception handling

Conclusion

Change collision management prevents the chaos of conflicting changes. By detecting potential collisions, applying risk scoring, and escalating high-risk collisions, organizations can reduce change-related incidents.

Action Items for Your Organization

• Implement collision detection in your ITSM platform
• Define collision rules based on service criticality
• Apply risk multipliers for concurrent changes
• Establish escalation paths for high-risk collisions
• Train teams on collision management