purpose: to analyze the efficacy in the three models of therapy with phonological basement in subjects with different degrees of phonological disorder severity. methods: the subjects in this research were 21 children, eleven males and ten females, with age mean: 5:7. speech data were analyzed through the performance of the phonological assessment. after the phonological assessment, the percentage of correct consonants proposed by shriberg & kwiatkowski (1982) was calculated and the subjects were then classified in the severity degrees regarding the phonological disorder in: severe, moderate-severe, mild-moderate and mild disorder. six0 subjects were submitted to the modified cycles model, 8 to the abab-withdrawal and multiple probes model and 7 to the modified maximum opposition model. making the comparison the generalization to other position in the word among three models of therapy within each degree of phonological disorder severity. results: the generalization to other position in the word occurred in all the studied models, however, abab-withdrawal and multiple probes model were more effective to the group with severe disorder; the modified maximum opposition model to the group with moderate-severe and mild-moderate disorder; and the modified maximum opposition and the abab-withdrawal and multiple probes models to the group with mild disorder. conclusion: all the subjects showed gains in the phonological system and relation to generalization of the other positions in the word, but the abab-withdrawal and multiple probes and modified maximum opposition models were more effective.