Symbols can play an important role in assisting people to use products and services more effectively. Their application is optimized when the same symbol is always used to represent the same message, and standardisation can provide a means for achieving this. In this project, five symbols have been tested and shown more effective than competing candidates. The testing methodology, carried out on the Internet, was mostly based on two standards defined for the testing of graphical symbols. These were: ETR070 June 1993: Human Factors (HF); The Multiple Index Approach (MIA) for the evaluation of pictograms and ISO9186 Second Edition April 2001: Graphical symbols - Test methods for judged comprehensibility and for comprehension. The symbols defined represent a set of access services, namely: subtitles, audio description, signing, speech output and spoken command.