Education quality--who is author

In schools or colleges text books are necessary to teach a particular subject. How text books are written various levels of classes.whate is the difference between the text books and reference books. In text books a set of learning outcomes is drawn up for each chapter and the content is selected for each chapter to achieve the objectives. The list of tables and list of figures are selected for each chapter.The questions for each chapter are selected.The list of references are also added at the end of the chapter.