Citizen science has grown significantly as an area of activity around the world with many different models of practice and forms of participation. Citizen involvement in science can be seen as part of a long history of the role of the amateur in science. Research in the USA and UK suggests that citizen science has a powerful potential to support participation in and the learning of science. Increasingly, research has sought to explore and measure the development of 'science literacy', science identity and learning outcomes through citizen science. The scale, focus, and organisation of projects