In communicating between teachers and students must use the right Indonesian language, so that effective communication can be realized. This type of research uses qualitative research methods. Data collection techniques were obtained from interviews, observations and documentation. The data analysis method used in this study used a descriptive analytical approach. Based on the output of the research, it was found that teachers experienced obstacles in managing the class, especially in attracting students' attention, giving instructions, revealing dan applying class rules dan mechanisms as a result, effective communication in class management has not been achieved, while in delivering subject, effective communication is relatively built. Bec...