Reza Akbari

Elizabeth Fricker’s writings on testimonial justification include some contrary ideas. In this paper, we propose Fricker’s theory of justification coherently and explain why she speaks of different ideas and which idea is more compatible with her general theory of knowledge. Fricker proposes three conditions for justification of testimonial beliefs for adults by appealing to commonsense world-picture and defining a paradigm case of testimony: justified belief of using speech act of telling, justified belief of the sincere of testifier and the competence of testifier. The speech act of telling itself requires that for example, testifier at least apparently speaks from his knowledge and thinks that hearer is ignorant of the testimony. We argue that various parts of Fricker’s theory face problems. For example, double standard about children and adults in testimonial justification is against unity of conception of knowledge. چون تعداد کلمات کمتر از 150 کلمه بود این عبارت در اینجا قرار گرفت تا اجازه عبور از این مرحله داده شود.

Avicenna, beside his theoretical discussions about experimentation, practically applied his experimental method to natural sciences studies such as medicine, biology, and meteorology. His theoretical discussions subsume propositions concerning the conditions under which experimental knowledge is attained, the components of this knowledge and its functions. Some of these propositions are as follows: necessity of recurrent observations for acquiring experimental knowledge, certainty plus conditional universality of such knowledge, and its role as demonstrative premises. Investigating the application of his theory in natural sciences propound two new features which were not elaborated in the theoretical discussions: fallibility of experimental knowledge and necessity of systematic observation. This research, using the analytic method and referring to both philosophical and scientific works of Avicenna, clarifies that a comprehensive definition of experimentation is dependent on considering extracted points from practical application of experimental knowledge, beside its theoretical components