This article explains the design and use of a computer-mediated assessment of the spring migration of salmon smolts on the Snake and Columbia rivers. It begins with a discussion of the students and their program of study. It then describes the assignment, which calls for a simulation analysis of various proposals to increase the number of smolts that survive the migration. The article explains three software programs that permit a large number of undergraduates to perform the required analyses. It then concludes with observations on students' learning and the author's plans to expand the exercise.
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