The Zimbabwe AIDS Prevention Project (ZAPP), on behalf of the Zimbabwe National AIDS Council (NAC), operates a program that provides health care for sex workers at 16 sites around Zimbabwe. Over 6,500 women have attended the program to date, with over half attending on multiple occasions. Eight mobile health care workers currently manage patient records for these 16 sites. Data are collected using two forms: demography and encounter. ZAPP would like to replace the existing paper-first data collection system with an electronic-first system. This project will develop an electronic system based on RTI's Coconut mobile application platform for use on tablet computers. 8-10 nurse counselors will use tablet computers to collect and manage case data offline. Data will be synchronized with a shared cloud database from 6 Internet-connected hub locations.