If someone says he/she understands human behavior, he/she is lying utter nonsense. Human behavior is inscrutable at worst and highly complex at best. Psychology is not an exact science, it will never be. Still, you can study this science as a guide.
What is Human behavior?
Human behavior is the potential and expressed capacity (mentally, physically, and socially) of human individuals or groups to respond to internal and external stimuli throughout their life. While specific traits of one's personality, temperament, and genetics may be more consistent, other behaviors will change as one moves along different stages of their life, i.e. from birth through adolescence, adulthood, and, for example, parenthood and retirement.
The reason most people fail to understand human behavior correctly is that they look at their behavior without considering other variables. If you did so then you might get the wheel incorrectly or fail to understand its function.
Behaviour is the result of interaction between individual characteristics and the characteristics of the environment in which the behavior occurs. Each person has a unique combination of characteristics. Some of these characteristics are present from birth; others develop over time. These can be called as inherited and learned characteristics. Although there are some inherited characteristics, these are very few, and not so significant. Learned characteristics are very important. Individual differences can be because of environmental, personal, and psychological factors. It is also due to physical and social factors. Learned characteristics are acquired as people grow, develop, and interact with their environments.
When an employee works in an organization, the organization takes care of that person by making him effective, as a worker and as a person.
People's behavior is need-based. By fulfilling these needs he is motivated positively and there occurs effective performance. So the management in the organization has to take care of these needs to have an effective performance. The management can show them how certain actions will increase their need fulfillment and if not; how it decreases their need fulfillment.
Imbalances in our brains can give rise to such conditions as anxiety, depression, and addiction, all of which can stand in the way of success and act as significant sources of unhappiness in our lives.
The fact that people do business with people they like may seem self-evident, and yet, many of us too often fail to treat business relationships as actual relationships.
The Social Approach has a great deal to do with the environment the person is in. The assumptions made about behavior come down to the fact that; it occurs in a social context, even when nobody else is physically present and that people’s behavior, thought processes, and emotions are influenced by other people and society.
You won't understand human behavior correctly before you take into consideration the person's beliefs, values, lifestyle, way of thinking, and all other variables that affect him directly or indirectly.