Abstract

The purpose of the paper is to evaluate of Imre Lakatos' MSRP. Presenting the methodology which is based on Popperian Refutationism, Lakatos intended to overcome Pluralism and distinguishes the best theory in science. The question is that did the lakatos' secondary change in the form and content of MSRP -against some historical facts and criticisms- make some serious deficiencies in his methodology? The answer to this question is positive. One of Lakatos' changes in MSRP is to resort to a new concept of "rationality". Presenting a logical analysis, the paper shows that this change causes MSRP to be unable to distinguish the best program among others. Furthermore he gives a new definition of the term 'methodology'. This definition, in its turn, makes MSRP main task to be inactive. Showing the irreparable harms Lakatos' changes produce in MSRP, the paper shows that these changes not only cannot get rid of the deficiencies therein, but it is also unable to meet lakatos' original purpose for MSRP.