Stephen M. Alessi

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Model transparency is increasingly identified as a positive or even necessary characteristic of system-dynamics-based learning environments, where model transparency is usually identified as providing modified causal-loop diagrams, equations, or verbal descriptions of a model. The theses of this presentation are: (1) Model transparency may be beneficial for(More)
National development planning is a decision process at the central government level that defines the strategic plan for a country's long-term development. The System Dynamics Group at the University of Bergen in collaboration with Millennium Institute and the University of Iowa is developing an interactive learning environment for national development(More)
When evaluating the effectiveness of interactive learning environments it is important to include measures of knowledge acquisition that complement measures of performance. In this paper we report on participants' knowledge acquisition in a dynamic decision making task where participants learned about and managed a small developing nation. In the course of(More)
This study investigated an instructional strategy to improve learning a complex model in a system dynamics based learning environment. The instructional strategy required subjects to explore key variables by manipulating dynamic graphs. Design of the strategy was posited upon principles of reducing cognitive load, facilitating mental models, enhancing(More)
Malignant metastases to the thyroid are rare and are even rarer from a colorectal primary. As these metastases are often asymptomatic, they are usually discovered incidentally on imaging performed as follow-up for the primary tumour. In this report, we present a case of metastatic sigmoid adenocarcinoma to the thyroid diagnosed and treated at our(More)
The omental bursa is a complex and important anatomical region. It serves as a barrier to block pathological processes, but it is also a channel for disease spread in the abdominal cavity. It is a large recess of the peritoneal cavity formed by a double-layered fold of serous peritoneum situated inferiorly to the liver, posteriorly to the lesser omentum and(More)
1 ABSTRACT The purpose of this body of work was to address medication errors and safe medication administration practices in relation to practicing nurses and nursing students via several different approaches. These different approaches will be presented as three separate papers but interrelated themes. The specific purpose for each paper and the(More)
Prior exploration is an instructional strategy that has improved performance and understanding in system-dynamics-based simulators, but only to a limited degree. This study investigates whether model transparency, that is, showing users the internal structure of models, can extend the prior exploration strategy and improve learning even more. In an(More)
Cancers arise from unregulated cellular growth and exhibits a range of pathophysiological characteristics and behaviour. The term " tumour heterogeneity " encompasses a broad range of tumour features that have arisen as a result of different mechanistic processes including stem-cell origin, tumour evolution (linked to genetic mutations and adverse tumour(More)