ABSTRACT
The discussion about scientific models has seen the introduction of a large number of different types of models. The aim of this chapter is to impose some order on what seems to be an amorphous multiplicity of models. We introduce each model type and then sort model types into four groups. Model types in the first group distinguish different ways in which models can relate to their targets. Model types in the second group differentiate between different kinds of model objects. Model types in the third group qualify different processes of model construction and different ways in which models can relate to theory. Model types in the fourth group capture different uses and functions of models in the practice of science.
