As a matter of fact, curriculum, materials, teaching methods, and evaluation should all be designed for learners and their needs. It is the teacher's responsibility to check to see whether all of the elements of the learning process are working well for learners and to adapt them if they are not. In other words, learners should be the center of instruction and learning. The curriculum is a statement of the goals of learning, the methods of learning, etc. The role of teachers is to help learners to learn.
Teachers have to follow the curriculum and provide, make, or choose materials.
They may adapt, supplement, and elaborate on those materials and also monitor the progress and needs of the students and finally evaluate students. Materials include textbooks, video and audio tapes, computer software, and visual aids. They influence the content and the procedures of learning. The choice of deductive vs inductive learning, the role of memorization, the use of creativity and problem solving, production vs. reception, and the order in which materials are presented are all influenced by the materials. Though students should be the center of instruction, in many cases, teachers and students rely on materials, and the materials become the center of instruction.