Maslow's hierarchy of needs Maslow is an U.S. psychologist. in 1943, he wrote the book : Motivation Theory of Human Beings.
In the book , he mentioned five hierarchy of needs. No1 is physiological needs. For emxmple: water, air, food, sex, sleep, elements that human necessary for live. No 2 Security needs. Security of life, job, moral ,properties, health, family. We could say No 2 last the lives of human compared to No 1. No 3 is about feeling. Friendship, love etc. Maybe feeling is the most important charcter which could apart human from animals. People could express feeling by language, gesture and actions. No 3 is the relationship between you ,your families and friends. It is your group. No 4 is about social elements. Such as self-respect, confidence, achievement, respect to each other. It could called soft qualification. We could live without No 4. But, it is symbol of our value system, both inside and outside. So , if we got these, we could be better. No 5 includes moral, creative, ability of solving problems, justice, capability of admit reality, we could call it self-realize needs. If we got these, we realized our dream and lived happy. And another question, why we need the theory. There is two question related to it. No 1 is what we need and when could we be happy. Sometimes people dont know the target of life. It is the exact answer for the question. No 2 is mostly for the boss , many boss dont know how to motivate the subordinate. So we could draw a conclusion , if we are boss, we should give enough money to the employee to surpport their lives , considing their personal lives and feeling, respect them, and make them thought that they're useful . And then, they are happy, bosses are happy.