2 On the basis of the previous list, item is grouped into one larger tab those ideas that express the same thing but with different words. 3 By reference to the previous grouping, become join the synthesis of views that express the same in one higher tab. 4. The procedure will be the same up to a tab in which all groupings through union linkages are collected. This technique can be used when it is necessary to generate a large number of ideas or concepts and are classified into categories.

Relationship diagram: these models express entities relevant to an information system, their interrelations and properties. The usefulness of this technique is very mean, when a topic is complex enough for his large number of causes, effects and inter-relationships. Wikipedia provides us with, that is a conceptual representation of the information. Through a series of procedures can be the e-r model to others, as for example the relational model. Modeling entity-relationship is a technique for modeling data using entity relationship diagrams. It is not the only technique but it is the most widely used. Briefly consists of the following steps: be part of a textual description of the problem or information system to automate (requirements).

A list of nouns and verbs that appear is made. Nouns are possible entities or attributes. Verbs are possible relationships. Analyzing sentences determines the cardinality of relations and other details. Made diagram (or diagrams) entity-relationship. Complete model with lists of attributes and a description of other restrictions that cannot be reflected in the diagram. Given rudimentary this technique it takes some training and experience to achieve good models of data tree diagram: is a graph that shows the objectives that are intended to achieve and the means to achieve them. The procedure of action allows that the objectives are developed as structured through conversion of media in new objectives.