Speech impairment: Problems in communication and related areas such as oral motor function, ranging from simple sound substitutions to the inability to understand or use language or use the oral-motor mechanism for functional speech.

Speech input or speech recognition: A method of controlling a computer and creating text by dictation. Speech input software is combined with a microphone.

Standard HTML: Version of HTML accessible by all browsers.

Streaming multimedia: A method of transfer- ring audio and/or video via a network from a server to an end user’s computer. During the transmission, the material is displayed or played on the target computer.

Stable surface: Stability is the degree to which a surface remains unchanged by contaminants or applied force, so that when the contaminant or force is removed the surface returns to its original condition. A stable surface is not significantly altered by a person walking or maneuvering a wheelchair.

Surface: The material on which a person walks or wheels in the pedestrian environment. Sidewalk surfaces generally consist of concrete or asphalt, but commonly include tile, stone, and brick. In addition to concrete and asphalt, trails can be surfaced with dirt, rock, gravel, sand, mud, snow, grass, and other substances.

Surface Transportation Program (STP): A Federal program that provides grants to States for federally funded roadways and enhancement projects.

Switch input: A method of controlling a computer or communication device. It is most often used with Morse code or scanning methods, but may also be used for controlling household appliances and related controls. Switches are available in a nearly endless ar- ray of sizes, shapes, and activation methods.

Switchback: A trail or road that ascends a steep incline by taking a winding course to reduce the grade of the path.

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