This is a useful interactive notebook to teach and reinforce letter naming, sounds, and formation. Each letter has a sorting page activity sheet and a trifold activity sheet. The sorting pages focus on identifying the upper and lower case letters and letter sounds. The trifold books emphasize the formation of the lowercase letters (the most important letters because they are used the most), identifying the lowercase letters, and letter sounds. The materials get glued into a composition notebook so your students can review previously taught letters while learning a new letter.