Psychologists have found that the implementation of policies allowing work schedules to be tailored to individuals' needs does not typically increase managers' job satisfaction or their efficiency—although this may be because most managers already have the autonomy to adjust their own schedules.
Information
causal + contrast (do /don't increase)
Implementing more flexible scheduling doesn't usually increase managers' happiness or efficiency, but it does increase happiness / productivity / attendance by nonmanagerial employees.
limits on causality
Over time the benefits dissipate, and if the schedules are too flexible, the benefits basically disappear.
Evaluate
Our goal is to think about how we can combine at least two of the facts we were given, but it's hard to see any obvious way we should be combining these.
There seems to be a tenuous benefit to flexible schedules, but it primarily applies to nonmanagerial employees in the short term, with schedules that are less than totally flexible.
Goal
Let's just look for the most supportable answer we can find.