The Delta Science Plan is a shared framework providing vision, principles, and approaches to better coordinate Delta science and more effectively communicate the outcomes of science activities and their management implication to policy makers. Initially released in 2013, the Delta Science Plan fulfills a recommendation in the Delta Plan (GR1) and also supports requirements in the 2009 Delta Reform Act, which calls for the use of science in the development and implementation of all Delta policies and management. The document is intended to be used by the broad Delta science community and was developed through an open, transparent, and inclusive process. The Delta Science Plan proposes mechanisms to conduct science in a manner that achieves the vision of One Delta, One Science. This vision refers to an open Delta science community that works collaboratively to build a shared body of scientific knowledge with the capacity to adapt and inform water, environmental, and societal decisions. To achieve this shared vision, the Delta Science Plan identifies six objectives, which are collectively supported by 26 actions. Together, these actions guide the development, coordination, and communication of science to provide relevant, credible, and legitimate decision-support for policy and management actions. The Delta Science Plan is also an element of the three part Delta Science Strategy, a collection of guidance documents to achieve the vision of One Delta, One Science. The other two elements are the State of Bay Delta Science, and Science Action Agenda.