Before FAT

• Test protocol agreed and signed before testing starts

• Production parts or products available in the right quantity

• Acceptance criteria stated as numbers, with measurement method

• Client operators and maintenance staff invited

At FAT

• Every safety function tested and recorded

• Cycle time measured over a defined run, not a single cycle

• Changeovers performed by client staff

• Fault recovery tested for the most likely faults

• Open items listed with owner and due date

Before SAT

• Utilities, floor and interfaces confirmed on site

• Installation plan aligned with production schedule

• FAT open items closed or carried forward explicitly

At SAT

• Safety functions re-tested in the final installation

• Performance run under production conditions

• Interfaces to upstream, downstream and MES verified

• Documentation and backups handed over

• Training completed and recorded

• Remaining open items signed off with dates

• Support contact and response terms confirmed