By their very nature, they are static tools for both students and teachers. A textbook cannot be altered to suit a student's reading level. This will affect students with learning disabilities or students who have limited English proficiency. Texts that are not well ordered or well organized also can lower students' interest and motivation in the subject material. A textbook also binds teachers to its limitations, biases, and occasional inaccuracies.
Some textbooks try to be all things to all teachers.
A general history of the world, for example, might leave out too much, gloss over too much, or end up so large that it is unwieldy and awkward to carry around school. Departments are sometimes forced to spend large portions of their budgets to purchase these tomes. Finally, teachers may only dip into portions of these books during the year. The result is a huge waste of paper and resources. New Potential Billions of words and millions of sites on the World Wide Web are available to teachers and students.