Thank you for youre quick response.
I would like to add the explanation of STAGES in the begninning.  I took from the website, but do you think that the following will be ok to add?

During the AT evaluation, the STAGES evaluation process was used as a reference to determine the basic building blocks for identifying skills for learning. The STAGES state that Access Skills are the fundamental motor, social, and communication skills that are prerequisites to any learning activities based on academic standards, and Entry Point Skills preserve the essential meaning or essence of the standards while allowing lower levels of sophistication and difficulty. Rubrics used to score the alternative assessment portfolios often indicate varying points earned, depending upon the complexity of the documented skills. 

Observation using Stage One Evaluation (Cause and Effect):

I also would like to know when to use STAGES and Stage one (which is level one)

I also would like to know how I can imply that I am not sure if he can do the following and does not know how to prove that if he can, but there is possiblity.

Referring to the section that you suggessted:
Yet he is not able to associate meanings with a few objects, associate picture symbols with a few objects, recognize that objects differ, or make a few choices. However, by taking small steps, Mr. S can expand his stage one entry point skills.