Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Cognitive dimensions or Cognitive dimensions of notations are design principles for notations, user interfaces and programming language design, described by researchers Thomas R.G. Green and Marian Petre. The dimensions can be used to evaluate the usability of an existing information artefact, or as heuristics to guide the design of a new one. Cognitive dimensions are designed to provide a lightweight approach to analysis of a design quality, rather than an in-depth, detailed description. They provide a common vocabulary for discussing many factors in notation, UI or programming language design. Also, cognitive dimensions help in exploring the space of possible designs through design manoeuvers.

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