In October 2015, the U.S. Department of Labor (DOL), Employment and Training Administration’s (ETA) American Apprenticeship Initiative (AAI) provided funding to 46 grantees across the country to expand registered apprenticeship into new sectors, such as healthcare and information technology, and to populations underrepresented in apprenticeships, such as women, racial and ethnic minorities, and veterans. In April 2016, DOL commissioned an evaluation of the AAI grants to build evidence about the effectiveness of registered apprenticeship for apprentices and employers. This report presents implementation study findings. The primary data source is a Grantee Survey administered to all grantees approximately four years into their grants, when grantees implemented most activities. This report first describes the characteristics of the AAI grantees and their experiences with designing and operating their apprenticeship training programs, including in occupations that do not traditionally use apprenticeship for training. The report then examines how grantees register programs, engage employers, and recruit apprentices to participate in their programs. The final three sections of the report focus on the delivery of related technical instruction and on-the-job learning for the AAI grantees’ respective programs; pre-apprenticeship programs offered by AAI grantees; and support services available to AAI apprentices and pre-apprentices.