The World Health Organisation says that people are more likely to change behaviour if

• encouraged to discuss a health message among themselves and to ask Questions to clarify their understanding
• been shown and fully understand how they, their family and community will benefit from changing their behaviour
• language used to communicate with them is familiar and compatible with the local culture and social norms, avoiding judgemental or prescriptive-sounding orders
• the person presenting the message or the source of information is well known and trusted
• they have repeated, simple and consistent messages from different sources
• given time to change, especially if change carries a cost, e.g. installing latrines!