http://www.esajournals.org/doi/abs/10.1890/110280

Ecologically oriented citizen-science experiences engage the public in learning while facilitating the achievement of robust scientific program goals. Evaluation of learning outcomes has become increasingly prioritized, requiring citizen-science program managers to understand key issues in evaluation. We argue that citizen science can have other, more far-reaching community-level outcomes, which have received less attention but warrant consideration for continued programmatic improvement.