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Abstract
Conversation which is a major human activity has been the focus of Grice’s maxims in his Cooperative Principle. The aim of the present study was to analyze the conversation section in the Iranian high school textbook entitled, prospect 3. To achieve this objective, the required data was elicited from 38 English high school teachers through questionnaires and analyzed via SPSS (V.16). The study used descriptive statistics. The statistical analysis of the data revealed that most of the conversations among students followed the Grecian maxims of quantity, quality, relevance, and manner. However, in three conversations speakers violated the maxim of quantity and manner-- the maxim of quantity, maxims of quantity and manner, and maxim of quantity were violated in lessons 1, 2, and 3 respectively.