The Center for Budget and Policy Priorities conducts research and tracks statistics on Social Security disability programs, and they’ve just updated two important publications on disability insurance (DI). First, the Chart Book presents nearly two dozen graphs that illustrate key DI facts: why it's important, why the DI rolls have grown, who receives benefits, and what financing issues the program faces.  Second, their primer (or "Policy Basic"), is a short backgrounder on the Disability Insurance program and why it's important. Both publications are available here: