An impact is an immediate effect or change produced by an intervention. In health education, these immediate changes may include changes in awareness, knowledge, attitudes, beliefs, skills or health-related behaviours. Impact evaluation refers to assessing the immediate effects of your health education activities on the people who have received health education messages. This type of evaluation is usually carried out at the end of your health education activities. You may be able to observe how people behave after receiving health education messages. If no improvement has taken place, then something is probably wrong, either with your message or your methods.