Acknowledgements

Ara would like to thank:

Chris North, Anne Rose and Egemen Tanin for helping me with my silly questions and paranoid worries.

Dave would like to thank:

Mom, Dad, and Bill for your time; and thanks for dealing withme during this busy semester. Thanks to the folks at Stanford forparticipating in the pilot study. And finally, thanks to the people at the ERC for doing that voodoo that you do so well.

All of us would like to thank:

Dr. Shneiderman for giving us invaluable feedback and for pointing us to useful references.
HCIL for allowing us the use of the lab to conduct our experiment.
All subjects who participated in the experiment.