Klaus Christoffersen

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This paper investigates the factors relevant to producing effective human factors design guidance, using the Engineering Data Compendium (EDC) as a research vehicle. A series of three exploratory experiments focusing on the factors that affect the usability, usefulness and viability of human factors handbooks was conducted. The results of these studies were(More)
One of the cornerstones of expert performance in complex domains is the ability to perceive problem situations in terms of their task-relevant semantic properties. One such class of properties consists of phenomena that are defined in terms of patterns of change over time, i.e., events. A basic pre-requisite for working towards tools to support event(More)
Data overload is a generic and tremendously difficult problem. We examine three different characterizations that have been offered to capture the nature of the data overload problem and how they lead to different proposed solutions. The first characterization is a clutter problem where there is “too much stuff,” which leads to proposals to reduce the number(More)
The practice of sedating patients in the hospital for diagnostic and therapeutic procedures may be associated with life-threatening respiratory depression. We describe a method that uses a simulated event to identify latent system failures. A simulated scenario was developed that was reproducible with realistic physiology that degraded over time if no(More)
Events: The Meaning of Change We humans do not live in a static world. Functioning effectively in our everyday environment depends intimately on being able to recognize and respond to different types of changing conditions. Similarly, the problem scenarios faced by human decision makers in complex operations environments are rarely static in nature.(More)
One of the cornerstones of expert performance in complex domains is the ability to perceive problem situations in terms of their task-relevant semantic properties. One such class of properties consists of phenomena that are defined in terms of patterns of change over time, i.e., events. A basic pre-requisite for working towards tools to support event(More)