http://whqlibdoc.who.int/hq/2000/TDR_IDE_RP_00.1.pdf

The manual describes the conceptualization, development, testing and adaptation of the pictorial reporting form to distribute ivermectin, summarizes the lessons learnt in the process, and relates these lessons and experiences to other research questions and topics. It also summarizes the principles of visual perception among illiterates which the form builds on, and which were confirmed by testing in different countries. Document in pdf format; Acrobat Reader required.