Some teachers may use the same ESP material for different classes ignoring the variation among different classrooms. Also, some of them may use the same material in all lectures. In this situation, students will get bored and may hate this class. That is why appropriate ESP materials selection would be important and can play a crucial role in ESP lesson planning. Ellis and Johnson (1994) distinguish between two levels of materials selection. The first one occurs at the beginning of the course when teachers suggest their coursebooks and materials. The second level occurs when the teacher is going to select items from the chosen coursebook.
esplearning 