(1) The set of rules and conventions that govern the creation and control of data types such as text, image, graphics, font, fax, color, audio, bar code, and multimedia.
(2) organisation and justification of static and behavioural artefacts for software and its structure.
(3) The fundamental organisation of a system embodied in its components, their relationships to each other, and to the environment, and the principles guiding its design and evolution.
(4) A set of defined terms and rules used as instructions to build products.