Expository teaching is a teaching strategy where the teacher presents the students with the subject matter rules and provides examples that illustrates rules. In expository teaching teacher gives both principles and problem solution. Simulation : It means role playing or rehearsal in which the process of teaching is carried out artificially. In the simulated teaching method the pupils are only acquainted with conditions. The word simulated means to immitate exactly. Mastery learning : It is a method of instruction where the focus is on the role of feedback in learning. It maintains that students must achieve a level of mastery before moving on to the next unit.