Therapeutic planning and evolution of children with speech sound disorders are related to both the initial assessment and to the complementary tests selected to be applied. Monitoring the case by regular evaluations adds important information to the diagnosis, which allows strengthening the initial findings with regards to the underlying deficits identified in the initial evaluation. The aim of this case report was to verify the effectiveness and the efficiency in using the Percentage of Consonants Correct - Revised (PCC-R) index as well as complementary tests of speech inconsistency, stimulability and phonological awareness skills in monitoring therapeutic intervention in children with speech sound disorders. The study included three male children. At the time of initial evaluation, Case 1 was 6 years and 9 months old, Case 2, 8 years and 10 months old, and Case 3, 9 years and 7 months old. In addition to the specific assessment of phonology, complementary tests were used to help in verifying the underlying deficits for each specific case. Subjects were also evaluated on phonological awareness abilities, speech inconsistency and speech stimulability. Data analysis confirmed that the complementary tests selected for this case study were effective and efficient to complement initial diagnostic as well as to demonstrate modifications that occurred in the three subjects with speech sound disorders.