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This paper explores how the RepTools toolkit was appropriated in two different classroom cultures. The RepTools toolkit consists of hypermedia about a complex system, physical models, and NetLogo simulations, designed to help students understand complex systems in the context of aquarium ecosystem. This paper reports on the nature of the different enactments of two teachers using the same tools. Although both classrooms showed similar learning gains, Interactions Analyses (IA) found differencesdblp:conf/icls/GrayHLJJSFWDS08 fatcat:xlk2q7tjjzfk7m6l4vtvtpvnpe