Knowledge is one of the most important issues in philosophical literature, since long, that considered by many philosophers. Ambiguity of knowledge has caused many different approaches about it, are propounded. In first step, this paper focuses on two view of justification of knowledge: Internalism, Externalism. And propounded some objections them. In second step, Goldman`s causal theory is expressed. According to Goldman, justification of knowledge is based on knower`s reliability whit regard to production source of belief while knower is independent on creditable theorems in his justification of belief that is criticized by some philosophers. Finally, the author shows in spite of improvements that he accomplishes but using some concepts such as »good action« and »motive«, for overcoming criticisms are expressed as »truth conditions«, but difficulties are not resolved because of ignoring the epistemic factor in the framework of induction and the metaphysic meaning of knowledge
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