So far, OFN has rated 22 agencies in a process that is similar, in some respects, to a rating from Standard & Poor's or Moody's. Stearns, for instance, does a site visit and examines financial metrics including asset quality and ratios around delinquent loan losses. The rating also takes into account non-financial performance--a departure from the S&P, Moody's and other ratings services.

Primary Care Development has received a Triple A+ 3 rating. The triple A is the highest rating the organization could receive for "impact", Manning explains. "The 'plus' means we are effective on the policy front and the three means our financial status is satisfactory." The highest rating any CDFI can receive is a Triple A+5, but Stearns says few CDFIs will rank that high.

"Some of the CDFIs have been surprised by their rating," she admits. "They want the best score and do not realize that few will come out in the best category. We have to convince some that a middle range three is acceptable."

A former financial executive in the for-profit world, Mike Crist, CFO of the Philadelphia-based Reinvestment Fund, which provides loans and investments throughout most of the Mid-Atlantic, is sanguine about the rating process, calling it "fair and rigorous." He is also realistic about its potential to attract new investment, at least in the mid term. "It will be a long way to go before mainstream capital markets will accept CARS as a legitimate rating system, if only because the bells and whistles are different from what they are used to," he says.

Crist and Manning agree, however, that CARS will help those funding sources that traditionally invest in community development projects, but haven't specifically invested with them yet. "In the competition for limited resources, a good rating should theoretically put the CDFI at the top of the list," Crist says. "In the not too distant future, CARS will be an investor requirement."

Once that benchmark is reached, the industry will try for mainstream investors--institutions, for instance, that are interested in leveraging the New Markets Tax Credits Program. A conceivable example is a securitization of charter school loans. Similar structures have come to market, Crist notes, albeit not quite on an arms length basis. "You have to accumulate sufficient collateral, say $100 million, to make the transactions fees worthwhile." Ultimately, though, he has faith CDFIs will eventually participate in mainstream markets. "We create marketable products. It is just a matter of time for investors to understand them," he adds.