How Long in 'Observation Mode'?

Hi,

My 7 year old son has been seeing a speech pathologist for over a year now.

We go for 30 minutes every week. He originally was recommended due to a 'speech disturbance' because it was obvious there was "something there", but no one could identify what IT was.

Anyway, as I understand that some of the process is determining what the underlining condition is (for lack of a better word), I am getting concerned that we are really wasting our time?

In all the time we have spent with this Dr. he has still to come up with any sort of diagnosis, and barring that, even any sort of plan to over come the disturbance. When I asked him directly he said he was still 'observing'.

When do I call it quits? Or move on to someone else?

Thanks.