Based upon normative and longitudinal data completed by the developer of the Compton PESL program,  a client may expect to achieve a 50% or greater improvement in the pronunciation of the sounds in English following participation in all 13 sessions and completion of the assigned practices at home.  The recommended amount of practice each day is 60 minutes, which may be completed in four 15-minute sessions or two 30-minute sessions.  As with any new skills, practice leads to improvement!  Of course, results cannot be guaranteed.