Traditionally, voluntary measures have been evaluated using the same framework regardless of their structure. The framework assumes that the measure provides partners with a treatment (information, research support, etc) that will not be transferred to nonpartners. In this framework, a voluntary...

The framework for voluntary program evaluation assumes that voluntary programs provide partners with information that will not be transferred to non-partners. In this framework, a voluntary program is said to be worthwhile if there are significant differences between the behavior of partners and...