Communicating Ocean Sciences to Informal Audiences (COSIA) is a National Science Foundation (NSF)-funded project consisting of seven long-term three-way partnerships between the Lawrence Hall of Science (LHS) and an informal science education institution (ISEI) partnered with an institution of higher education (IHE). Together, educators from the ISEI (often aquaria) and the IHE prepare and implement a course designed and adapted by the Lawrence Hall of Science. This course introduces college students (usually science majors) to inquiry-based pedagogy and learning theory. Together with the ISEI educators, the college students then design and implement activities to teach ocean science concepts to visitors on the ISEI "floor". The long-view goal of the COSIA project is to develop ocean science literacy at all levels and to encourage broad public understanding of science and environmental stewardship. The COSIA project fits well with the longitudinal commitments of the LHS to ocean science literacy, in terms of curriculum development and professional development. For decades, LHS has offered MARE (Marine Activities, Resources, and Education), a whole-school interdisciplinary ocean science immersion program that provides professional development for teachers, curricular materials, and resources for families. For nearly five years, LHS has also been a keystone of the Center for Ocean Sciences Education Excellence--California (COSEE CA), one of twelve existing COSEE centers funded by the NSF Geoscience Directorate, Division of Ocean Sciences. This report is designed primarily to speak to the funder of this project, the ISE division of NSF; however, the authors hope that it will also provide helpful information for the designers of other similar initiatives, distilling more general lessons learned about the design and implementation of COSIA, as well as its potential future as a network. After summarizing their evaluation activities to date, this document presents their current findings of COSIA using research and theory as a way to further explain the salient defining features and to convey what the project has accomplished. Following their findings, they present Inverness Research's perspective on COSIA as an investment and a network of partnerships. (Contains 2 figures.)