Solar water disinfection (SOD IS) is a sustainable method of water treatment. Despite the simplicity and many advantages of SOD IS, past behaviour change campaigns have seen limited success. This study aims to compare intervention strategies in their efficiency in changing behaviour and to analyse which behavioural factors are differentially affected. The following factors were analysed in this study: intention, subjective norm, behavioural control, beliefs, habits, frequency of talking, knowledge and tension. The promotion strategies used in this intervention study were promoters, a pass-on task, prompts, public commitment and disseminating knowledge with inducing tension. Inhabitants of high-density areas near Harare, Zimbabwe, were interviewed at different points in time. High SODIS consumption was achieved when the promoter intervention was followed by a memory-aiding technique such as prompts or public commitment. Consequently, this combined-intervention strategy increased all behavioural factors and kept them at a high level. A continued pass-on task alone did not change behaviour and had decreasing effects on several behavioural factors. When the pass-on task was combined with disseminating knowledge with inducing tension, high SO DIS water consumption was also reached, but several behavioural factors stayed at a low level. More effective intervention strategies are identified and discussed.

Solar water disinfection (SODIS) is a sustainable water treatment method. With the help of the sun and plastic bottles, water is treated and illnesses prevented. This paper aims to identify the factors influencing SODIS uptake, that is, why someone may become a SODIS user. This uptake decision can be influenced by persuasion. From behaviour theory, variables are recognised which have been proven to influence intention and behaviour and simultaneously can be influenced by persuasion. A total of (n = 878) structured interviews were conducted in a field study in Zimbabwe. Linear and binary logistic regressions showed that several of the initially proposed persuasion variables have significant influence. Persuasion factors have a stronger influence on the uptake of SODIS use and on intention to use SODIS in the future than on the amount of SODIS water consumed. Ideas are presented for using the effective variables in future SODIS campaigns and campaigns in other fields.

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This paper aims to contribute to the growing body of literature on evaluation of community participation in the water and sanitation sector. The first part discusses the conceptual underpinnings of participatory approaches. The paper then analyses stakeholder perceptions about the Household-centred Environmental Sanitation (HCES) approach, a participatory planning approach recently validated in two countries: Lao People's Democratic Republic (PDR) and Nepal. Post intervention surveys were conducted with experts and key informants in both countries to assess satisfaction regarding degree of participation, effectiveness of planning outcomes and process efficiency of the participatory planning process. It specifically looks at the variability in people's perceptions about the costs and benefits of community participation. Empirical findings show that experts and participants show high satisfaction rates regarding involvement in decision making. The earlier and stronger residents were involved in the process, the higher the satisfaction rate. In a second part, the main findings of expert interviews are contrasted with the perceptions of the community at large which participated in the participatory planning process. A better understanding of community participation in urban settings is needed regarding skills, motivation, time, and defining the right levels of participation.

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