Bockman's post summarizes the findings of Where are they now? A study of the impact of relocation on former residents of southwest Washington, who were served in an HWC demonstration project, pulling out some interesting findings. For example, I would not have expected government officials to have two groups of residents, one a control group and the other one that received additional supports. This is but one of the interesting items from the book.
If you do public policy in DC, read the Bockman piece. It's worth the time.