If your DC has been diagnosed with apraxia, I second the recommendation for a PROMPT certified SLP
http://promptinstitute.com/index.php?page=what-is-prompt. At 2 years of age, my DS had very few words and those he did have were difficult for someone unfamiliar with him to understand. He was diagnosed with a delay and began speech therapy shortly afterwards. He made very slow progress and at age 3, he was diagnosed with apraxia. It wasn't until he was 4.5 that we started working with a PROMPT certified SLP. We'd had good SLPs before but the PROMPT SLP was the best. She identified foundational problems the other SLPs had not identified and not addressed (like his tongue protruding on certain sounds and his jaw 'sliding' when he verbalized). He made significantly more progress than with the other therapists. He's now 6 and his motor control for speech production is far better. His biggest challenge now is related to how he processes language and since the PROMPT therapist is an SLP, she is also addressing that.
The PROMPT method seems to be the better approach for kids with apraxia. Since apraxia is a disorder involving motor planning and control, it would make sense to use a therapy approach that works to address the motor challenges with speech production. Our developmental pediatrician also thought it was a good approach for apraxia and he thinks highly of the practice we go to - Children's Speech and Language Services (Springfield/Arlington).
http://www.cslstherapy.com/ I actually learned about PROMPT and CLS from this forum!