Thesis (M. Tech.) - Central University of Technology, Free State, 2009 / The aim of health communication campaigns and visual communication material (VCM) is to positively influence audience health behaviour and attitude. VCM has been used in this respect effectively as a vehicle to convey information about HIV/AIDS over the past three decades. It has been used to promote health knowledge and awareness in order to reduce the transmission of the virus. The aim of this study was to determine the efficacy of graphic imagery in HIV/AIDS VCM. To realise this aim, the researcher set the following objectives: * To review relevant literature in order to isolate key features and process those that communicators must consider/follow when developing HIV/AIDS VCM; * To determine the comprehension of selected outdoor HIV/AIDS messages, the graphics used in these messages, illustration preferences, and an evaluation of the self-efficacy of selected loveLife outdoor visual messages; and * To propose a model that communicators can use as a guideline when developing VCM. The outcome of the review suggests a compilation of features, design guidelines and variables that may contribute to the effectiveness of VCM. The results of the empirical study indicate that suitable graphic imagery fosters message comprehension, while inappropriate imagery inhibits comprehension, and realistic and appropriate imagery is preferred to abstract and representational imagery. Familiar images can contribute towards improved comprehension of HIV/AIDS messages. These findings also gave birth to the proposed ‘O’ communication model, which is a reflection of the results of the empirical study.