Extensibility is a system design principle where the current implementation takes into consideration future growth. It is a systemic measure of the ability to extend a system and the level of effort required to implement the extension. Extensions can be through the addition of new functionality or through modification of existing functionality. An overriding theme is this is done without impacting (changing) the current system functions. Categories: Move to Wiktionary | Computer stubs ... For the Macintosh operating system, which was called System up to version 7. ...

Although usually applied to software, it can be applied to anything. Houses can be built with future extensions in mind. The Bloor Street Viaduct was built to accommodate a future subway line. Computer software (or simply software) refers to one or more computer programs and data held in the storage of a computer for some purpose. ... The Bloor Street Viaduct, or simply the Viaduct, is the popular name of a bridge that spans the Don River Valley in Toronto, Ontario, Canada, crossing over the Don Valley Parkway and Bayview Avenue as well as the river. ...