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Overview of advantages

“A model is a useful representation of a specific situation or thing. Models are useful because they describe or mimic reality without dealing with every detail of it. They typically help people analyze a situation by combining ideas with information about the specific situation being studied. Models help us to make sense of the world’s complexity.” (Steven Alter, Information systems, ISBN 0-13-043242-3)

Just communicating about a system can be difficult because different people in the same conversation related to an information system often attach different meanings to common terms. ISA-88 and ISA-95 provide definitions of batch control terminology and enterprise-control system integration terminology. This terminology is presented within models, which explains the relationship between the words. For example, in the physical mode, the process cell is place on a higher level than the unit, which explains that a Process cell has one or more Units.