This report documents the implementation and early impacts of Year Up--a national sectoral training program for urban young adults aged 18-24. Operated by an organization of the same name, Year Up provides six months of full-time training in the IT and financial service sectors followed by six-month internships at major firms. The full-time program provides extensive supports--including weekly stipends--and puts a heavy emphasis on the development of professional and technical skills. Year Up is one of nine programs in the federally sponsored Pathways for Advancing Careers and Education (PACE) evaluation. It is among the most intensive workforce training programs tested to date. More than half (59 percent) of the program's $28,290 per-participant cost is funded by employer payments for interns. Using a random assignment design, the study found that Year Up increased receipt of employment and training services. Compared to control group members who were not able to access the program, treatment group members were more likely to report that their classes used active learning methods, taught life skills, and were relevant to their lives and careers. Most importantly, young adults with access to Year Up had higher average quarterly earnings in the sixth and seventh quarters after random assignment--the confirmatory outcome selected to gauge Year Up's overall success for this report. Persisting over a three-year follow-up period, Year Up's earnings impacts are the largest reported to date for workforce programs tested using a random assignment design.