The Practitioner's Toolkit for Marine Conservation Agreements (MCAs) was developed to help conservation organizations determine: what MCAs are, when MCAs can help abate threats to ocean and coastal species, habitats, and ecosystems, and how to plan and proceed with MCA projects. The major components of the toolkit are organized in a logical progression of ideas and phases: overview, field guide, field projects, country/region/state analyses, U.S. state maps, and resources.