Modelling

Abstract

This chapter treats the problem of representing apriori structure information based on facts, assumptions, and hypotheses. It outlines some common ways to bring detail into the descriptions of model structures ℳ. That cannot be done without loss of generality. In fact, the whole purpose of modelling is to restrict the set of all possible models so much that the remaining set has so few degrees of freedom left, that identification will be able to use available data to pick a model from the set. The difficulty is to do the reduction without excluding all valid models.