James Moffett asserts that the inner speech is basically sourced out of different experiences people witness throughout their lives.  Either these experiences are personal or impersonal, written or expressed vocally, Moffett believes they would be valuable as a basis from where we could choose variant ideas and develop them to a writing piece.
Based on this principle, Moffett in his article "Group One Revising Inner Speech" presents guidelines teachers could use as methods to help their students improve their writing skills easily.  For instance, when Moffett says "For fifteen minutes write down, pell-mell, everything that comes into your head, using the first words that occur to you and without concerning yourself about grammar...the purpose of this assignment, best done at first in class, is manifold: 1) To limber up the student and make his writing fluent and natural; 2) To show him that there is plenty to write about if he just becomes aware of what is going on in and around him... To provide a sampling of his own verbalization which he may subsequently examine to learn about the putting of things in words" (Moffett 29) he explains, as a first guideline teachers would assign a 15 minutes writing therapy of whatever comes out of mind in an impulsive way.  This method makes student indirectly notice important subjects they were not aware of.  Therefore, once they write them down, they realize they are plenty of topics they can write about easily.
Moffett also believes that observing is another therapy that is based on what people see, and sense by themselves. It is a good method that would help writers explore different topics from the notes they impulsively took while they were observing things closely.