The author has reflected that such theory of human behavior should encompass within its scope manifold issues, including layers of analysis from individual to organizational and social, harmony with current understanding of social and biological sciences, ability for empirical testing, universal cultural applicability and lucidity of the theory so that it can be taught and used easily (Stark 131).
The author, in the context of arguing about the importance of a unified theory of human behavior, has adopted a quite well structured form and also has provided considerable focus over four major driving forces that mainly determine nature of human behavior. However, understanding the driving forces and their role in construction of human behavior would not have been easy unless prior to the section he has provided a brief explanation about “Evolution of the brain” (Stark 131). In this section the author has shown that evolution of human brain is mainly responsible to determine behavior of individuals and their choice of actions, “…evolution has selected several innate skills for human including habitat selection, food selection, danger awareness, intuitive psychology, orientation, justice, and an ability to remember important people” (Stark 132). The limbic part of human brain specifies and differentiates “incoming sensory messages” (Stark 132) and human beings, consecutively, also respond to those impulses depending on their needs. The author’s emphasis on this functional aspect of brain explains the necessity for human beings in the context of acquiring, learning, bonding and defending themselves.
Aftermath, the author has explained the four drives, which he considers as the main forces in determining human behavior. The D1 or Drive to Acquire is the first force that determines instinct of human beings in the context of acquiring certain basic