an investigation into oral interaction in language classes: a conversation analytic point of view the aim of this thesis is to analyze the interaction between language teachers and students in english language institutes. this work is done in the context of yasuj city. learning another language, which is in most cases english, involves many variables. one of these variables is the linguistic behavior in english classes. by linguistic behavior we mean the oral interaction in english classes. oral interaction can take place between teachers and learners and among learners themselves. as mentioned above, oral interaction has a determining role in english classrooms. according to long (1996: 185), "(language) learning occurs in interaction, not as a result of it". this is especially important in efl contexts, given that in this context opportunities for real interaction are severely limited. today after the emergence of new methods and theories in language teaching, the order of the interaction in language classes has been considered as one the most important factors in the language teaching process. this was highly approved by the emergence of communicative language teaching approach. previous works investigating oral interactional process have been mostly done from the discourse analytic point of view. assuming the importance of the role of interaction in language classes, this study aims to analyze the interaction process in yasuj language institutes based on the conversation analysis method. conversation analysis is a field that focuses heavily on issues of meaning and context in interaction. it does so by linking both meaning and context to the idea of sequence (john heritage, 1995). to this end twenty classes were chosen from yasuj english institues. these classes were audio-recored and transcribed. then they analyzed through conversation analysis. as result, it was found that the order of interaction in yasuj institutes is not consistent with the principles of conversation analysis. key words: interaction, conversation analysis.