One study found that EPM did enhance productivity, but only in ways that are consistent with the effects of social facilitation. Employees working on a data entry task were monitored while working alone, with others, or as part of a cohesive group. Results indicated that EPM improved the performance of highly skilled workers, but interfered with the performance of those who were less skilled. Moreover, with the exception of those working in a cohesive group, monitoring was found to increase workers' feelings of stress and anxiety. On the other hand, participants responded more favorably to performance monitoring when they believed that they could turn off the monitoring and that only their job-related activities were being evaluated. Also, EPM was viewed more positively when workers were given the opportunity to participate in decisions regarding the use of the system. Results support that the effect of social facilitation is not just limited to the physical presence of others, but also extends to presence in a virtual sense as well.