This activity was shared as part of a workshop at ICTD2012. This activity was designed for ICTD2012 for this workshop: http://ictd2012.org/opensessions/306. See the introductory workshop slides at: http://openmi.ch/ictd2012-workshop. The attribution tags that accompany this activity are at http://openmi.ch/ictd2012-activity-tags. This document is licensed under a Creative Commons Attribution 3.0 license http://creativecommons.org/licenses/by/3.0/.