The theater play in the current era becomes extensively diverse due to the disintegration, the genre deconstruction, the hybridization and etc.. Many plays in various formation converge many studies on anthropology, folklore, sociology, biology, culture, recognition and others beyond the research category of theater study and are analysed in the research categories of inter-disciplinary convergent approach. Patris Pavis views plays in various forms that change in the current era as in the category of ``plays of the extended concept`` called as ``Performance`` and is making efforts to establish theatrical study and analysis methodologies in more general view point to analyze plays in extended concept. This study introduces his critics on Korean Tradition Accepted Modern Plays and considers why the theatrical study methodologies of extended concept that he is interested in connection with his critics on plays. Although he is said not to have sufficient theatrical expertise, his attempt may become noticed as a high encouragement in the current study environment lack of choice, but being dependent only on inter-disciplinary convergent researches.