Dear Colleagues: The editors of the Communications of the ACM have invited me to guest edit a special section on persuasive technologies. My charge is to highlight the four or five most important issues in this domain. If you'd like to participate in this special section (either by heading up an article or contributing as a co-author), please feel free to contact me. If you'd like more information on persuasive technologies, see http://www.captology.org. --BJ Fogg ``''``''``''``''``''``''``''``''``''``''``''``''``''``''``''``''``''``''`` BJ Fogg, Ph.D. Stanford Persuasive Technology Lab Box 8338 CSLI / Stanford University Stanford, CA 94309 [log in to unmask] ``''``''``''``''``''``''``''``''``''``''``''``''``''``''``''``''``''``''``