To stay relevant to changing communities, many arts organizations have been developing engagement programs--that is, programming designed to reach more and different people and involve them more actively in how art is made and experienced. While engagement efforts are often episodic or separate from an art organization's core programming, in late 2013 a group of 10 arts nonprofits across California set out to make engagement central to their identities as part of the New California Arts Fund [NCAF]. To do this, they pursued transformations in their programmatic, organizational, and business models. This evaluation documents their achievements and challenges, and provides considerations for arts organizations and funders interested in reaching ethnically diverse and/or low-income communities. [For the Evaluation Summary, see ED604068. The James Irvine Foundation commissioned Slover Linett Audience Research to design and conduct a multi-method evaluation of the NCAF experience of the initial 10 grantee-partners during the first three years of their participation in this initiative.]