Henry M. Halff

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The Experimental Advanced Design Advisor (XAIDA) is a system for the development of computer-based maintenance training. XAIDA acquires knowledge of a device from a subject matter expert and applies common maintenance-training procedures to generate interactive training from the description. XAIDA provides maintenance training in four areas: the physical(More)
This study provides a numerical representation of contextual effects on the meanings of words, constructed from the order judgments of 19 subjects concerning the word "red" in 19 sentences. Subjects judged whether or not the red object mentioned in a sentence was redder than, less red than, or could be equally as red as the red object mentioned in each of(More)
Presented here are several techniques for design and development of computer-based adventure games for science education. Among the issues addressed are how subject matter maps to content, generative techniques for problem-solving practice, use of visualization, mechanisms for instructional support, and approaches to game development.
Electronic games have significant potential for overcoming major difficulties in science education, namely, the necessity for practice, the abstract, complex nature of the material, and the sparse opportunities for observation. A role-playing game with a many-layered story that reflects the structure of the domain can use several mechanisms for enhancing(More)
NOTICES This technical paper is published as received and has not been edited by the technical editing staff of the Armstrong Laboratory. When Government drawings, specifications, or other data are used for any purpose other than in connection with a definitely Government-related procurement, the United States Government incurs no responsibility or any(More)
A poorly designed knowledge base can be as cryptic as an arbitrary program and just as difficult to maintain. Representing control knowledge abstractly, separately from domain facts and relations, makes the design more transparent and explainable. A body of abstract control knowledge provides a generic framework for constructing knowledge bases for related(More)
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