The present article critically discusses about the relation of theory and experimentation. This text is based on rational reasoning. The problem is that dominantmethodology on the relation oftheoryandexperimentationisbasedAristotelian logic in which experimentation has Context of Discovery or context of justification. In Iran, positivism and it’s relation with critical rationalism are misunderstood. This paper attempts to solve this kind of methodological issues through critical discussion. First, we discussed about epistemic apparatuses of positivism and critical rationality. Then, after critical discussion about the two epistemic apparatuses, fuzzy methodology is formulated as result of criticism excised the intellectual traditions. In the end, positivism is discussed as a problem in Iran.

Keywords: Epistemic apparatus of critical rationality, Epistemic apparatus of positivism, Impressions and ideas, Verification, Falsifiability, Fuzzyepistemic apparatus

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