ISA88 is a standard for batch control and standardises many terms and structures. ISA88 was released in 1995 and is in widespread use throughout industry as the batch control standard. ISA88 defines both a Physical Model and a Procedural Model.
The physical model defines a Process Cell must contain Units, may contain Equipment Modules, may contain Control Module. This physical model means one structure can cover anything from a simple standalone pH meter as a Unit, or a multi building reactor.
The Procedural Model (Software/process model) defines a Procedure containing Unit Procedures, containing Operations, containing Phases.
ISA88 also defines key recipe terminology and structure.