Anon71027- Sometimes it is difficult to mention all of the possible topics associated with speech therapy. You seem to have great knowledge of the subject.
Speech therapy is therapy that is offer to children and adults that need to correct their speech or restore it.
Often speech therapy if offered once it is determined what the problematic speech patterns the patient has problems saying. For example, children usually have difficulty with the letter S.
A child that speaks with a lisp is mispronouncing the letter S. this can be corrected through various speech exercises as well as training the child's the proper tongue placement in order to produce the correct sound.
With the letter S, the child should grit his teeth and have his or her jaw totally clenched. Children that speak with a lisp and have difficulty with this sound often stick their tongue slightly out when pronouncing the letter S.
Teaching a child's the proper tongue placement with the use of the mirror, as well as repeating words that begin or end with the letter will provide the practice necessary to overcome the speech problem.