[kod]

And what exactly do you think objective metrics for developers should be? LoC? Defects? As soon as a measure becomes a target, it ceases to be a useful measure.

If one person in a group takes unfair advantage of flexibility by e.g. only going to the office half as much as the rest, it sure will have an effect on the "other apples".

[ageofwant]

Why would she need to go to the office? Work is something you do, not a place your'e at. If you, as a manager do not have any way of measuring how the people you are managing, then you have no reason to be there.