Processes
A process has a beginning and an end. It is a defined process with precisely defined rules. At the end of the process, there is a result. A result can be: A product, a service – service, a document, a piece of information.
Process a series of steps with beginning and the end aim is the result in order to transform something.
Model
It is a simplified, yet possible exact reflection of reality. Often only the relevant information flows into this image. E.g.: Road Map.