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Accurate simulation conditions for Factory Acceptance Testing (FAT) are essential when implementing new computer process control and information systems. The conditions for the system's testing begin with defined test procedures and include proper setup and configuration of the hardware components, as well as utilizing accurate test simulation software and data. This presentation examines the management and implementation of software factory acceptance testing. The management aspect looks at scheduling resources, equipment and space requirements, and the tasks and costs associated with equipment setup, power and communications. This presentation also includes a look at the technical aspects of executing the testing, including preparation of procedures, simulation code requirements, viewing and recording test results, and simulation data input for real-time testing. Field commissioning is the time to tune software parameters under real equipment and runtime conditions, not for major debugging of code. Commissioning is the highest cost impact time as mistakes not only impact software development costs, but impact all other labor disciplines associated with the startup and the high cost of production downtime. This can be managed and prevented through structured test procedures. Sound testing is the result of planning, scheduling, identifying the required equipment and simulation methods and following procedures. This will provide an accurate simulation for FAT.