The Western Riverside County Multiple Species Habitat Conservation Plan has been presented to the public as a complete draft having been reviewed and modified as a result of comments from resource agencies, the Scientific Review Panel (SRP), local stakeholder groups, cities, and numerous other individuals at key intervals in the planning process. The goal is to develop a land-use plan that preserves open space for individual species of concern, protects existing natural communities that sustain the biodiversity of the planning region, and creates constraints for planned growth and development of the region that respect the rights of property owners. It seeks to use the “Best Available Science” as an approach to the planning process. This document is a review of the "science" in the final draft of the Western Riverside County Multiple Species Habitat Conservation Plan, by the Science Review Panel assembled by the Center for Conservation Biology at the University of California, Riverside.