WHY... There is no man in the world that tell "I am wrong". Yes, there is no man in the world who tell that. Then this that one believe that he/she think true, not at all is a proof for that he/she is true. All villain in the history some how suppose themselves right. also good men, slaves, free men, fools and wises, all assume themselves right, and alas the fools most consider themselves right. In way of thinking, asking good questions is half the way. Then let ask some questions. If we human are not those who determine what is the truth, then what is it? Another question is that, why people think in different ways? And how one think, or in other word what is the process in which we think? And at last, why people act in different ways? In this book, I want to try to answer this question and describe the situation in which we are all trapped. WHY PEOPLE THINK AND ACT IN DIFFERENT WAYS? When two object in the same position treat in different ways, binary we seek difference in them. Now what about the people. The people treat different in different positions. There are some possible answer: 1) The thing that make decision in all people is the same and the difference in act is because of the difference in conditions people involved. 2) The thing that make decision in people is different and also the conditions is different. let a bit illuminate these problem. first we must determine that what is the border between the situation and one who make decision? For example, an individual has some characteristic. His/her past, the genetic characteristic he/she has and the situation he/she is involved. And despite all of these we define something that we call it "self". Self is one who make decision. Now we have two theory. 1) difference between people only arise from their characteristic. 2) difference between people arise from both the characteristic and the self. I do not know which of these theories are true and do not know how we can judge among them. may we cant judge among them. Its better first we deal with another question by the hope that the answer may we prepare for that lead us in more clarifying this matter. HOW ONE THINK OR IN OTHER WORD WHAT IS THE PROCESS IN WHICH WE THINK?