Abstract
This chapter is an introduction in the field of system investigation with presenting basic directions used in the computing filed as benchmark, modelling and measuring (monitoring). A brief discussion of features and capabilities for each approach without going into depth is presented to determine the place of modeling in the sphere of methods and tools for investigation and evaluation of computer parameters and processes. Some examples of carried out experiments for discussed approaches are presented as initial information. In general modeling theory, two main groups of models can be defined (physical and mathematical), and the place and features of computer modeling as a part of the mathematical models is discussed. Another topic discussed in this first chapter is the consideration of modeling as a method of scientific knowledge. In addition, the expediency of using computer modeling, as well as the main directions of its application are discussed.