1. A plea for quantitative targets in biodiversity conservation Marc-André Villard and Bengt Gunnar Jonsson; 2. Setting conservation targets: past and present approaches Bengt Gunnar Jonsson and Marc-André Villard; 3. Designing studies to develop conservation targets: a review of the challenges Marc-André Villard; 4. Testing the efficiency of global-scale conservation planning using data on Andean amphibians Don Church, Claude Gascon, Megan Van Fossen, Grisel Velasquez and Luis A. Solorzano; 5. Selecting biodiversity indiators to set conservation targets: species, structures, or processes? Sven G. Nilsson; 6. Selecting species to be used as tools in the development of forest conservation targets Jean-Michel Roberge and Per Angelstam; 7. Bridging ecosystem and multiple-species approaches for setting conservation targets in managed boreal landscapes Pierre Drapeau, Alain Leduc and Yves Bergeron; 8. Thresholds, incidence functions and species-specific cues: responses of woodland birds to landscape structure in south eastern Australia Andrew F. Bennett and James Q. Radford; 9. Landscape thresholds in species occurrence as quantitative targets in forest management: generality in space and time? Matthew G. Betts and Marc-André Villard; 10. The temporal and spatial challenges of target setting for dynamic habitats: the case of dead wood and saproxylic species in boreal forests Bengt Gunnar Jonsson and Thomas Ranius; 11. Opportunities and constraints of using understorey plants to set forest restoration and conservation priorities Olivier Honnay, Bruno Hérault and Beatrijs Bossuyt; 12. Setting conservation targets for freshwater ecosystems in forested catchments John S. Richardson and Ross M. Thompson; 13. Setting quantitative targets for recovery of threatened species Doug P. Armstrong and Heiko U. Wittmer; 14. Allocation of conservation efforts over the landscape: the TRIAD approach David A. Maclean, Robert S. Seymour, Michael K. Montigny and Christian Messier; 15. Forest landscape modelling as a tool to develop conservation targets Emin Zeki Baskent; 16. Setting targets: trade-offs between ecology and economy Mikko Mönkkonen, Artti Juutinen and Eija Hurme; 17. Setting implementing, and monitoring targets as a basis for adaptive management: a Canadian forestry case study Elston Dzus, Brigette Grover, Simon Dyer, Dave Cheyne, Don Pope and Jim Schieck; 18. Putting conservation target science to work Marc-André Villard and Bengt Gunnar Jonsson.