- System Integration Testing (SIT)
- SIT evaluates system components' interactions with hardware and software
- Developers perform SIT to check module integration and data flow
- SIT combines integration and system testing approaches
- Two main testing methods: top-down and bottom-up integration
- Tests internal and external interfaces between modules
- User Acceptance Testing (UAT)
- UAT validates system functionality against user requirements
- End users perform UAT to check system acceptance
- Two types: alpha testing at developer's site and beta testing at customer sites
- Acceptance criteria include product, procedure, and service level agreements
- Tests functionality from end user's perspective
- Key Differences
- SIT focuses on system integration, UAT on user requirements
- SIT requires specialized developers, UAT performed by customers
- SIT tests before UAT, detects issues in data and control flow
- SIT issues focus on system components, UAT on user functionality