This is a revised and extended version of a manual, Become a Problem- Solving Crime Analyst, that we wrote for the Jill Dando Institute of Crime Science at University College London, with financial support from the Home Office.We are most grateful to the Institute and to the Home Office for allowing us to produce this version for the United States. We are also grateful to the Office of Community Oriented Policing Services for commissioning the work. In the Acknowledgements page of the earlier version we thanked many colleagues and friends on whose work we had freely drawn. Those who have materially assisted us in completing this version by supplying material for inclusion, commenting on drafts, or in other ways, include: Stacy Belledin, Rachel Boba, Karen Bullock, Barbie Brookover, Christopher Bruce, Andy Brumwell, Graham Farrell, Rob Guerette, Samantha Gwinn, Shane Johnson, Johannes Knutsson, Gloria Laycock, Nancy Leach, Deborah Loewen, Tamara Madensen, Mangai Natarajan, Cynthia Pappas, Ken Pease, Nanci Plouffe, Barry Poyner, Jerry Ratcliffe, George Rengert, Nick Ross, Kim Rossmo, Rana Sampson, Matthew Scheider, Karin Schmerler, Michael Scott, Nick Tilley, Susan Wernicke, Matt White, and Deborah Lamm Weisel.We thank all of them.