ACKNOWLEDGMENTS

We thank the Xerox PARC Embedded Computation Area group for their comments on and involvement in the studies, the use of the AspectJ weaver, and the fast responses to solving the few problems with the environment that occurred. We also thank Robert Rekrutiak and Paul Nalos for their contributions to experiment setup and design, Gregor Kiczales and Robert Bowdidge for their comments on an earlier draft, and our anonymous experimental participants. This research was funded in part by Xerox Corporation, in part by the Natural Sciences and Engineering Research Council of Canada, and in part by a University of British Columbia Graduate Fellowship.