Epistemology - it is a theory of knowledge. According to joey, every theory of knowing includes 3 things: believe in the knower, the known and the process of knowing. Every believe system, there are those who in the know, what is known and how we know. Scientific approach (positivist), also instrumental paradigm, is the idea that there are facts out there to be known. It believes that good science should be value free from one"s own values. They think that a when a researcher brings his own personality and emotions, it brings mistakes. There is a power relationship between the researcher and the person being researched. There is an example of the scientific that there are only 2 sexes male and female. All scientific research is based on that there are only 2 completely different sexes. It looks at the power relation and social structure and how they interact and promote actions towards justice.