In almost every real-world application of this measuring productivity is a drag. It's almost as if it's subject to the Heisenberg Uncertainty Principle. In th

In almost every real-world application of this measuring productivity is a drag. It's almost as if it's subject to the Heisenberg Uncertainty Principle. In this case with the tools you're using you're not getting an accurate reading of productivity because typically the burden is on the subject to make the readings and they will get annoyed at this intrusion into their day job. So how do you measure tasks without being intrusive? Is it really possible?