This paper explored the effectiveness of a hierarchical Treatment of Aphasic Perseveration (TAP) program on an aphasic in two regards: decrease in the frequency of perseveration and improvement in naming ability. The subject was a 54-year-old female with Transcortical Sensory (TCS) aphasia following a left ischemic Cerebrovascular Accident (CVA). It was concluded that the hierarchical TAP program was more effective and efficient in terms of decreasing perseveration and increasing correct naming performance. Within the data of the hierarchical TAP program, however, a substantial decrease in the frequency of occurrence of perseverative behaviors did not necessarily result in proportionate improvement of naming ability. The probable causes and reasons were discussed.