What is impact?

• Impact is a multi-dimensional concept. Some definitions focus on very precise understandings of impact, while others cast a much broader net. • How impact is defined and used has a significant effect on the design, management and evaluation of development programmes. • Development programmes should hold explicit conversations with different stakeholders about how impact is used and understood, in order to come to a shared understanding. • There are six dimensions of impact that may help development programmes be clearer about what they mean.