Soft Computing Evaluation Logic

3.4Aggregation Techniques and Tools

E pluribus unum (From many, one).

—The Seal of the United States

Theoretical aspects of aggregation operators are presented in detail in Part Two, and the use of LSP aggregators to build LSP criteria is introduced in Section 3.1.4. In this chapter, we assume that readers are familiar with the basic knowledge about idempotent aggregators and their use in the LSP method. So, we will now focus on strategic decision, techniques, and tools that are necessary in the process of professional development of complex LSP criteria and their aggregation structures.

3.4.1 Selecting GCD Aggregators for an LSP Project

The first strategic decision that must be made at the beginning of each LSP project is the selection of the type of GCD aggregators. The seven main types (discussed in Sections 2.4.12, 2.9.2, and 3.1.4) are presented in the decision tree shown in Fig. 3.4.1. UGCD aggregators are a default choice based on a constant number of soft and hard aggregators. GGCD is a more general group selected when evaluators know to select a suitable location of threshold andness. Low‐precision aggregators are suitable for introductory educational experiences. High‐precision aggregators are used in most delicate professional projects. Medium‐precision aggregators (including WPM.17) are used in all other situations, and consequently, they are most frequently used in practice, as a balanced combination of simplicity and precision.

Figure 3.4.1 Selection of ...