We have designed and built many control systems for batching plants, with a variety of automation hardware and software being used. One system that we designed and built was installed for an overseas client and used a Siemens S7 400 PLC at its heart with WinCC SCADA as the main operator interface and data repository. The system was put together in a way such that it complied with a suitable subset of ISA S88, and it used a flexible recipe system at the top end to provide a very cost effective solution that was operator friendly and easily maintainable by the client staff. The system was installed in our factory for the full electrical fit-out and system testing including full client witnessed FAT execution. The system was installed and fully commissioned on site and supplied with a full GAMP compliant documentation set.