Noting "our current understanding of UK wildlife and the wider environment is due in large part to the dedication and expertise of the naturalist community," this "Guide to Citizen Science" serves as a beginner's manual for furthering citizen science projects. The guide is comprehensive (nearly 40 pages in length), yet well organized and easy to read with bullet points, figures, flowcharts, and examples. After a brief glossary with definitions of key terms, the resource divides into phases: Before You Start, First Steps, Development Phase, Live Phase, and Analysis and Reporting Phase. At the end of the guide readers will find additional Resources and Links, including sub-sections on Citizen Science Web Portals and Select Citizen Science Projects for readers interested in participating. Scientists from the Biological Records Centre and the Natural History Museum Angela Marmont Centre for UK Biodiversity wrote the guide, and the UK Environmental Observation Framework provided funding. Readers can learn more about the authors and partners on the concluding pages.