**9. Conclusion**

Three key steps can be identified in this chapter. Each one represents a polarization of the research approach toward an organized objective in a paradigm. The first group of researchers [5, 8–10], naturally focused on objectivity, considering the scientific context of their time. Without abandoning the search for this quality, their successors [4, 11, 18, 19] realized that the very high domination of method over subject led to conclusions, which, although correct, were difficult to transpose to the reality of the situations.

The adoption of new investigation approaches is characterized by three options: process the globality, process the conducts in natural environment, consider the forces and the dynamisms of systems (and sub-systems where applicable). Applied to decision-making processes in special situations, these new approaches also have a very strong impact on the overall evolution of psychology and on its mutations toward new boundaries.
