Many people will be familiar with the ground breaking work of the late Joseph Sheehan, a speech pathologist in the USA who came to be a fluent speaker. He had real insights into the condition and once made the, at first seemingly paradoxical, remark that stuttering* has nothing to do with speech but is a condition relating to the social presentation of the self. At Mastering Change we totally agree with Joseph Sheehan. How you think is the stammer. When you anticipate how you're going to 'perform' in a speaking situation, that in itself is part of the stammering behaviour - people who don't stammer don't do this. The Mastering Change programme aims to modify your thinking to a healthier, freer way of being, designed to benefit your whole life not just your speech.
* in the USA the word stuttering is used - it means just the same as stammering.