Is a complex, integrated process involving people, procedures, ideas, devices, and organization for analyzing problems and devising, implementing, evaluating, and managing solution to those problems, involved in all aspects of human learning. Is a very board item. It is the application of scientific findings in our method, process or procedure of working in the field trip of education in order to effect learning. It embraces curriculum and instructional design, learning environment, theories of teaching-learning. It is also a filed study and a profession. It is the use of all human inventions for teachers to realize their mission to teach in order that students learn.