An on-going problem with detailed models is that it is difficult to take into account the many interrelationships among relevant factors such as varying grades and dynamic types of interdependencies. It is also difficult to make completely accurate measurements and then place these initial variables into a model.
A computer is a good tool for the visualization of models and changes within. For example, computer models are used to make predictions regarding near-future weather conditions. Logistic modeling, a tool with many social applications should match up with reality as much as possible.
Many models exist for engineering, psychoacoustics, for generating profit with a business, for content distribution with RSS and in computer networking there is the client-server model. Other models of interest include: