Introduction

• Models are tools of inquiry in a way that theories may not be.
• By representing the system being observed, they provide a way of working through the problems of a “real world” system in a more abstract way.
• Models provide the “what” and the “how,” they are not as suited to explaining “why,” and therefore are rarely as satisfying as strong theory.

Four Functions of Model

Model should provide four functions.

1. The simplest definition of model is that is an equivalent. It should organize a complex system as general as possible. Models give us an idea or complicated objects or events in a general way
2. Model should provide an experimental function. A model can be constructed to describe the particular form of behavior of which no theory exists or is inadequate
3. The most important purpose of model building is to assist in the development of more precise theories. Theories are not model and the most fundamental difference between them is that the theory is an explanation and a model is a representation.
4. They should also provide some form of measurement of the system that will work analogously within the model and within the actual system being observed. Model represents system or process. They are symbolic way at system to help us to think about them more logically