Quote: there is no way to name procedures or objects in a direct manipulation interface and hence no abstraction or user- definable concepts

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Finally, there is no way of naming procedures … [in a direct manipulation interface] … ones. … [p. 71] The ability to name composite objects and … abstraction. Without these abilities we cannot express higher-level … [For example,] The concept of an "eclipse" is not built into the … write procedures that search for eclipses, record them, …   Google-1   Google-2

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Quote: abstraction and user-definable concepts require the ability to name objects, operations, and parameters

Related Topics

Topic: direct manipulation for a UserInterface (56 items)
Topic: abstraction by name (29 items)