This article is an extract of the “Complete Systems Analysis” written by James and Suzanne Robertson. It explains the basics of analysis models and emphasize that the important thing to remember is that modeling tools are complementary. Each shows one aspect of the system. Together, they make a complete working model of the system.
This article provides knowledge on how to understand the model produced by system analysis. The authors explains that it is difficult to understanding a large and complex system. You can only achieve this by controlling the amount of information you take in at a time. To control this amount of information, you use a decomposition approach: the system is divided into components that are divided in sub-components until they are readily understandable. The best way to divide the system is to limit the number of interfaces for each sub-system. The conclusion of the authors is that “modeling tools are complementary. Each shows one aspect of the system. Together, they make a complete working model of the system.”
Read the complete article on http://www.informit.com/articles/article.aspx?p=2122833