Nine Years?

From a press release:

The U.S. Social Security Administration has awarded Abt Associates a contract to implement and evaluate the Benefit Offset National Demonstration (BOND). The demonstration, mandated by Congress in 1999, will determine whether retaining benefits at higher levels of earnings will increase employment and income for recipients of Social Security Disability Insurance (SSDI). ...

Congress mandated this study to test the effect of reducing the SSDI benefit by $1 for every $2 of countable earnings above the SGA threshold. In addition to offering this positive financial incentive, the demonstration will also test whether offering BOND participants enhanced counseling--to assist them in understanding the rules changes and taking advantage of them--will lead to higher earnings than only eliminating the "SGA cash cliff." ...

After a pilot period to test important implementation procedures, the full demonstration is scheduled to be launched in April 2011 and will involve approximately 90,000 participants in ten large, randomly selected sites around the U.S. SSDI beneficiaries will be randomly assigned to treatment and control groups for the purpose of testing the incentives. The results will be followed over the course of the nine-year period.