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Many small foundations are skeptical of impact investing, with 38 percent saying it will hurt returns, 36 percent saying they lack the capacity to do it, and 32 percent citing worries about risk, according to a new survey.

The report from Exponent Philanthropy, which represents foundations with few staff members, also found that 16 percent of respondents participated in “mission or impact investing,” and another 11 percent plan to do so in the next few years.

The findings are consistent with data about large foundations, which also shows low levels of participation in impact investing despite much public discussion about the practice.