A great thing about a textbook, workbook, or kit is that is continuous - the student can see that he or she is progressing systematically. Each assignment relates to what came before and what will come ahead.
Students see the educational purpose of textbooks, workbooks, and kits.
Teachers who teach from a textbook have the problem solved of how to organize work so that it is continuous. There is a problem in the more open style of teaching found often in elementary schools. Usually, textbooks are used in some subjects, such as math and spelling. Occasionally, social studies, science, language, and health textbooks are used. One technique is to use a syllabus and to share it with students.