Discusses several objections to Krashen's Input Hypothesis which states that language acquisition is the learners' understanding of a language at a stage slightly higher than their current one because of their understanding of extralinguistic cues of the language. (Author/LMO)

Analyzed sound systems of six phonologically disordered children and assessed relative phonological knowledge of target sounds. After-treatment results indicated that error sounds of which the children had the most knowledge were easiest to learn. Treatment beginning with the most difficult sounds resulted in more widespread changes in the…