D.C. Code § 2-218.71

(a) Every 3 years following October 20, 2005, the Department shall submit to the Council and the Mayor the results of an independent evaluation of the certified business enterprise programs. This evaluation shall compare the costs of contracts awarded pursuant to this subchapter to the cost of contracts awarded without use of the set-asides and bid preferences authorized by this subchapter. This evaluation shall also compare economic outcomes such as revenue, tax payments, and employment of District residents for certified business enterprises certified pursuant to part D of this subchapter to economic outcomes for similar firms that are not certified pursuant to part D of this subchapter .
(b) The Department shall review the findings in the triennial report and the goals, intents, and purposes of this subchapter. The Department shall transmit to the Council and the Mayor a report setting forth any recommended amendments to this subchapter.