No matter who does the survey or how many times the surveys are done, the overall response of employers to questions about moving employers to a private health exchange is: "I want to see more evidence that they work and will save us money."

A plethora of such studies has emerged in the last year — plus as more consulting firms and health insurers have launched private exchanges aimed at soaking up corporate business. The latest such survey, commissioned by the Private Exchange Evaluation Collaborative, confirms earlier study results.

It reveals that, while an increasing number of corporations think they'll be ready to make the private exchange decision down the road, currently, most remain unconvinced of their efficacy. Their interest is piqued. But, according to this survey, they have more questions about private exchange costs, operating systems and options than they did a year ago.