While vowels are not consistent at the single-letter level, they tend to be more consistent in letter clusters or higher order units. Therefore, a program designed to teach reading without resorting to teaching single-vowel mappings has been developed. The reading program involves teaching single consonants, selected whole words, and higher order units that are at least 90% consistent in the language. Children are taught one consonant and two units in each of the program's 30 lessons. Computer analysis has revealed how quickly the program enables children to develop an enormous reading vocabulary. Two tests of the program with Title I students have revealed large gains in reading vocabulary. These results compare favorably with those from other currently available reading materials. (JL)