This is a summary of a chapter from PAI's Accessing Assistive Technology Manual. There are laws and rules that public agencies must follow. If you believe you are entitled to assistive technology benefits, but the agency refuses to provide them for you, you can speak up and fight for your rights. This is advocacy.
Common sense is a good guide to being an advocate.
Here are some tips. Gather all the facts. You can get facts by looking at all the documents about the dispute that are in your file at the agency. Learn the rules. Educate yourself about the standard the agency used to deny your request.