... those aspects that are relevant to the research problem at the time (Johnson 19 92). A case is a unit of analysis, for example, in education research, a case is probably a learner, a teacher, a ... well in the pronunciation of English if the pronunciation class is taken out of isolation and becomes an 'integral part of the oral communication' class (Morley ,19 91) . The goal of pronunciation ... However, there is research that indicates that the teacher can make a noticeable difference if certain criteria, such as the teaching of suprasegmentals and the linking of pronunciation with listening...