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Simply put, “effective communication” means that whatever is written or spoken must be as clear and understandable to people with disabilities as it is for people who do not have disabilities. This is important because some people have disabilities that affect how they communicate.
[U.S. Department of Justice, "General Effective Communication Requirements Under Title II of the ADA," ADA Toolkit, Chapter 3 (2007): http://www.ada.gov/pcatoolkit/chap3toolkit.htm.]