Perform a review of the change.  Involve the CAB for appropriate changes.  The change will have one of the following outcomes:

• The Change has had the desired effect and met its objectives and succeeded. 
• Users and Customers (stakeholders) are content with the results, or to identify any shortcomings. 
• There have been no unexpected or undesirable side-effects to functionality, availability, capacity/performance, security, maintainability etc. 
• The resources used to implement the Change were as planned. 
• The implementation plan worked correctly (include comments from the implementers). 
• The Change was implemented on time and to cost. 
• The remediation plan functioned correctly, if needed.

This post-implementation review (PIR) is intended for all changes, but is especially important for major changes.  Check that:

• the change met its objectives
• the customers are happy with the results
• there have been no unexpected side effects. Any nonconformity should be recorded and action taken
• lessons learned are passed to the Knowledge Management system as advanced practices

List any actions that should be taken after implementation of the change.