I consider this program a supplemental support to the Mister Smith's Letter Recognition Program (uppercase) and I suggest if you are just beginning letter recognition with your child/student that you start with them.
The concept and structure of the cards are very similar. Letter and pic on the front and description of how to teach on the back. Lowercase letters can be difficult to distinguish because of their similarities and directionality has to play a big part in how these more difficult letters are taught.
The letter are categorized into easy, medium and more difficult letters represented by a * for easy, ** for medium and *** for more difficult.
14 easy letters-⭐️c, f, i, j, k, m, o, s, u, v, w, x, y, z (because of their similarity to uppercase)
6 medium letters-⭐️⭐️a, h, l, n, r, t
6 more difficult letters-⭐️⭐️⭐️b, d, e, g, p, q