What is UAT (User Acceptance Testing)?
UAT is the final testing phase where business users validate that the configured ERP system meets real-world requirements before go-live.
Definition
User Acceptance Testing (UAT) is the stage of an ERP implementation in which actual end users, rather than developers or consultants, execute the system against real business scenarios to confirm it works as intended. Testers follow scripted test cases that mirror everyday processes such as creating a sales order, running payroll, or closing the books, and they log any defects or gaps. Unlike system or integration testing, which verifies technical correctness, UAT validates business fitness for purpose. Successful UAT, evidenced by signed-off test scripts, is typically the formal gate that authorizes the project to proceed to cutover and go-live. Issues found during UAT are triaged into must-fix items and post-go-live backlog items.
How UAT Works in ERP
In an ERP project, UAT is usually run against a dedicated test environment loaded with migrated and cleansed data so users test with recognizable records. Key users or power users from each department own the test scripts for their processes and sign off when results match expectations. UAT outcomes feed the go/no-go decision, and the defect list directly shapes the hypercare priorities after launch.
ERP Vendors with Strong UAT
Oracle NetSuite
The original cloud ERP — built for fast-growing companies
Microsoft Dynamics 365
Modular ERP + CRM tightly integrated with Microsoft 365
SAP S/4HANA Public Cloud
Standardised cloud ERP with quarterly auto-upgrades and low TCO
Acumatica
Resource-based cloud ERP — unlimited users, pay by usage
Frequently Asked Questions
Who should perform UAT in an ERP implementation?
Business end users and key users from each affected department perform UAT, not the IT team or the implementation consultants. They are best placed to judge whether the system supports the actual work, while consultants support by fixing defects and clarifying configuration.
What is the difference between UAT and system testing?
System testing checks that the software functions technically correctly, often performed by the implementation team. UAT checks that the configured system meets business needs in realistic scenarios and is performed by end users, serving as the formal approval gate before go-live.