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Knowledge acquisition is the biggest bottleneck in the development if expert systems. Fortunately, the process of translating expert knowledge to a,form suitable for expert system development can benefit from methods developed by cognitive science to reveal human knowledge structures. There are two clusses of t h i w investigative methods, direct and indirect. We provide reviews, criteria for ' use, and literature sources for all principal methods. Direct methods discussed are: inret-views, questionnaires, observation of tusk perjbrmance, protocol analysis, interruption analysis, closed curves. and inferential flow analysis. Indirect methods include: multidimensional scaling, hierarchical clustering, Kenera1 weighted network.s, ordered trees, and repertory grid analysis.

A number of disilanes have been synthesized from a stable silylene, 1 (N,N'-di-tert-butyl-1,3-diaza-2-silacyclopent-4-en-2-ylidene), and a variety of halocarbons. It is proposed that disilane formation is a result of an initial halophilic interaction between the silylene and halocarbon. Formation of disilanes from 1 and CCl4, 2a, CHCl3, 2b, CH2Cl2, 2c, benzyl chloride, 2d, and bromobenzene, 5, are described here. An X-ray crystal structure of 2b was determined.

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