The Vietnamese Sound System at FSI comprises of 25 parts: Part 1Part 1: Introduction to the Viet Sound System Part 2Part 2: b, đ, m, n; i, ê, e & thanh ngang, thanh huyn Part 3Part 3: c/k/q, ng/ngh, nh; u, ô, o & thanh sc, thanh nng Part 4Part 4: h, kh, g/gh; ư, ơ, a & thanh hi, thanh ngã Part 5Part 5:Getting ready for the textbook Part 6Part 6: ph, v, l, r; ia, ưa, ua & thanh huyn, thanh hi, thanh nng Part 7Part 7:t, th, ch, tr/w/ (u,o) & thanh ngang, thanh ngã, thanh sc Part 8Part 8:x, d/gi, s; /i/ (i, y) & tone combination Part 9Part 9:ă, â; final consonants: m, n, nh, ng & tone combination Part 10Part 10:iê, ươ, uô; final consonants: p, t, ch, c & tone combination Part 11Part 11:Double vowels Part 12Part 12:Triple vowels Part 13Part 13:Tone combination Piloted program of the FSI Vietnamese Sound System