The Auditory Discrimination in Depth (A.D.D.) Program suggests that there is a direct relationship between auditory discrimination or auditory perceptual ability and the development of competency in language and literacy skills. (Auditory perceptual ability is defined as the ability to discriminate individual phonemes and to track their changing temporal relationships as oral patterns vary.) Individuals with sub-standard language and literacy skills can often discriminate test pairs correctly as to sameness and difference, but cannot indicate how or where the patterns are different. The A.D.D. Program has proved "effective in developing the ability to conceptualize auditory patterns in detail." This program, developed in remediation of language and/or literacy problems for both children and adults, provides for a grasp of the interrelationships between speech, writing, and reading, and establishes a circular auditory-visual-vocal check system which allows each skill to support and reinforce the others. One feature of the program is the use of labeling and syntactical mediation to establish awareness of auditory, visual, and kinesthetic relationships among the phonemes of English. (The author's detailed description of this program, "The A.D.D. Program, Auditory Discrimination in Depth," May 1969, is published by Teaching Resources, 100 Boylston Street, Boston, Mass. 02167.) (AMM)