"What is a model? Searching Internet one can find several definitions for the word model: A representation of a system, process, etc, in mathematical terms. A representation of the essential aspects of an existing system (or a system to be constructed) which presents knowledge of that system in usable form. A mathematical representation of a process, device, or concept by means of a number of variables which are defined to represent the inputs, outputs, and internal states of the device or process, and a set of equations and inequalities describing the interaction of these variables"-- Provided by publisher.
Includes bibliographical references and index.