Venture philanthropists and social investors have long struggled to measure the true impact of the organizations they fund.

But a new Web-based evaluation tool, the Portfolio Data Management System (PDMS), promises to allow donors and investors to track their investments’ performance and let them, along with the social enterprises they fund, compare their data to those of organizations doing similar work. Salesforce.com, which granted 5,000 nonprofits free licenses to access its customer...


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