Concepts are the fundamental and basic unit of thought. Text book plays an important role in students and teachers concept attainment. Textbook Content is enriched with many concepts. All the concepts are not equally important in textbook content. Many times students as well as teachers felt difficulties that which concepts are most important and which are not. So, what should be the criteria /methods/ strategies /Process/ prerequisite students as well as teachers should adopted for selection and differentiate between important and non-important concepts in Text book content?