what professor kohane found was 20% of our homeless population -- he was talking about single adults -- 20% of the homeless population was consuming 80% of our resources. resources meaning not only dollars, but emergency room visits, mental health services, treatment, emergency shelter, interactions on the street with police and fire. and that research and data drove thinking around the country that if we really address and focus our resources on this 20%, in san francisco it's probably higher, we could begin to make a dent in not only these people's lives and help house them, but also be able to focus our resources on those most in need. and hopefully down the road, begin to see some relief in some of those system of care and be able to focus on the larger population. so, that was our plan. the plan that we developed in '03 and '04 was, i don't know, 80, 90 pages with dozens and dozens of recommendations. you can really sort of filter the recommendations down to three broad areas. one was around plan engagement, the second was around supportive housing, and the third was around prev