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Describes the design of a prototype for the graphical user interface component of an electronic classroom (ECR) application that supports real-time lectures and question-and-answer sessions between an instructor and students. Based on requirements analysis and an analysis of competing products, a Web-based ECR prototype was produced. Findings show that good user interface design is critical to the successful use of collaborative learning technology. (AEF)

Gunn rat dams were tested for differential retrieval of theft jaundiced versus non-jaundiced offspring in 2 experiments. In Experiment 1, in which testing took place every day from Day 1 to Day 8 postpartum, non-jaundiced pups were retrieved significantly faster than jaundiced pups. In Experiment 2, in which testing took place every other day from Day 1 to Day 15 and the pups were weighed each test day, the order of retrieval of the 4 gender/genotype (jaundiced vs non-jaundiced) classifications as found in the 1st experiment was replicated and the non-jaundiced pups tended to be retrieved faster. Heavier pups were retrieved significantly faster than lighter pups, indicating that weight or size may be a cue to differential retrieval. [ABSTRACT FROM AUTHOR]