The document provides information about teaching the assessment of speaking skills related to vowels and vowel contrasts in English. It includes a chart of the vowel sounds in English represented using phonetic symbols. It also lists 10 phonetic generalization rules for vowels, including rules about short and long vowel sounds in one-syllable words, vowel sounds at the end of words, and the influence of silent e and y on vowel sounds. Examples are provided to demonstrate each rule. The document concludes with pronunciation drills to distinguish between short and long vowel sounds in words.