SIBs use all the important work on the field of social impact assessment in three ways.

FORBES: Making Your Tax Dollars More Effective: A New Model For Impact Investing

Unlike most funding for social projects, which tend to pay for inputs, SIBs rely on results.

ECONOMIST: Social Impact Bonds

Ownership of the U.S. operation is split among Laurent, Nathalie and two sibs back in France who head up the original operation.

FORBES: Magazine Article

Globally Systematically Important Banks (G-SIBs) must implement these principles by January 2016 and are expected to start making progress toward implementation now.

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One of the first SIBs was launched in 2010 by the St Giles Trust, a charity providing access to housing, training and jobs for ex-offenders.

BBC: Charitable bonds explained

SIBs are intended to scale up proven programs which have been designed and implemented based on evidence of good practice, and tested and demonstrated to work.

FORBES: Making Your Tax Dollars More Effective: A New Model For Impact Investing

Unlike traditional bonds, SIBs do not have a fixed rate of return as financial return depends on the achievement of specific social outcomes set at the start of the bond issue.

BBC: Charitable bonds explained