Appendix C Glossary

abstract component An abstract placeholder for actual user interface components that represents either tools or materials or containers or controls within a content model.

abstract prototype A prototype in the form of a content model and a navigation map.

abstract use case A superclass serving as a placeholder for shared or common sequences inherited by subcases that are specializations; may not in itself be enacted by an actual user.

acquisition facilities Those portions of a user interface supporting novice usage through ease of use, rapid learning, and immediate access to system capabilities; are characterized by obvious and familiar features and behaviors, high feature visibility, abundant feedback, simplified and standard ...

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