Reasoning From First Principles in Electronic Troubleshooting

Article Abstract:

Expert systems which reason from first principles use an understanding of the structure and function of that which they are examining. Such a system for troubleshooting digital electronic devices is considered. It is shown that the traditional approach of test generation has practical shortcomings. Discrepancy detection is shown to have limits in dealing with certain classes of faults. The concept of using models of causal interaction is explored. The importance of making the models explicit, separate from troubleshooting and retractable is discussed. The diagnosis of a bridge fault is used to demonstrate the concepts.

Artificial intelligence, Expert systems, Problem solving, Troubleshooting, Models, Diagnostics

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User Error or Computer Error? Observations on a Statistics Package

Article Abstract:

One of the factors limiting the growth in computer usage by non- computer people is the difficulty of learning to use the software. A study has been conducted of the errors a group of psychologists made while using a statistics package. The results are presented with an analysis of the error classifications. The differences between batch and interactive processing are also discussed. MMIF guidelines are used to frame the discussion.

Error analysis (Mathematics), Performance Measurement, Study, Software Complexity, Error Analysis

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Task Analysis and User Errors: A Methodology for Assessing Interactions

Article Abstract:

An understanding of how errors occur in a system's use can lead to design improvements of the system. Command language-based systems are particularly good for analyzing how errors occur. The system usage of several psychology students using a statistics package, SPSS was analyzed. Most errors occurred in using MONITOR commands. Analysis of the errors can be used to modify system interface.

User-Friendliness, Hardware Error, Command-Driven User Interfaces, User Error

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