<qa>  How many sessions per week will be held constant?This research is designed to examine the effects of treatment intensity on outcomes associated with an established treatment for acquired apraxia of speech AOS. Intensity in the form of dose frequency and total intervention duration will be evaluated with Sound Production Treatment SPT. The investigators will examine the effects of intense dose frequency nine, one-hour sessions per week and traditional dose frequency three, one hour sessions per week. Total number of treatment sessions will be held constant allowing for comparison of total intervention duration 27 sessions over 3 weeks versus 27 sessions over 9 weeks. A two-phase, group cross-over design will be used. Thirty-six participants with chronic aphasia and AOS will be quasi-randomly assigned to one of two treatment groups - intense first or traditional first 18 per group. One group will receive SPT applied with intense dose frequency SPT-I followed by SPT applied with traditional dose frequency SPT-T. The other group will receive the treatments in the reverse order SPT-T followed by SPT-I. A two week no treatment interval will separate the treatment phases. The outcomes of interest will address changes in trained speech behaviors, untrained speech behaviors, and speech intelligibility and patient-rated communicative functioning. 