Models are designed to represent reality from a certain aspect
Systems chosen for examination are usually highly complex.
By examining them, the aim is to learn more about their specific characteristics. To this end, we often disregard certain other characteristics. Some aspects are highlighted, others are ignored in a certain phase of the examination.
This way we get a clearer picture about the examined aspects. However, we also have to determine the validity of the results.
Examining the same system from other aspects, we can create a different model.