Orpington's ERP Go Live Readiness Checklist

O R P I N G T O N T E C H N O L O G I E S Every interface to and from the ERP has been tested end-to-end, not only tested in isolation. Integrations have been tested at realistic production data volumes, not sample-sized test data. Error-handling and retry behavior for failed integration calls has been tested, not just the success path. Middleware, API gateways or EDI connections have documented, tested failover procedures. Timing and sequencing dependencies between integrations are documented and tested, not assumed. Third-party vendors or partners connected via integration have been included in test cycles. Monitoring and alerting for integration failures is live before go-live, not added afterward. A named technical owner exists for each integration, reachable during cutover weekend. 6. CUTOVER AND ROLLBACK PLANNING 8 points A detailed, hour-by-hour cutover runbook exists and has been walked through by the full team. Specific go/no-go checkpoints are defined during cutover, not just at the start. A documented rollback plan exists, including the criteria that trigger it and who is authorized to call it. A defined post-go-live stabilization period exists before legacy systems are decommissioned. Communication to end users and external partners about the cutover schedule has gone out with adequate notice. Hypercare support staffing (extended hours, on-site presence) is arranged for the first weeks after go-live. Backup and disaster-recovery procedures for the new production environment have been tested, not just documented. A lessons-learned review is scheduled for after stabilization, with a mechanism to act on the findings. The ERP Go-Live Readiness Checklist | Page 4 of 5

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