Some focus on one, some on several systems processes. They would be included in the workbook under that systems process. In this Information Category we intend to collect tools or techniques that seem to be associated with a particular ISP. For example, systems dynamics tools are focused on feedback loops. There are other techniques, for example statistical packages, that will do hierarchical clustering so would be included under hierarchy. There are numerous computer packages that produce different types of fractal structures. Often books on fractals have DVD’s included that build the fractals discussed in the text.