Most people measure productivity in terms of work, what they’re paid to do.
I prefer a different measure.
Productivity is the measure of how effectively you get done the things you rationally, explicitly want to do (including work when necessary). Productivity is the output of the exercise of free will. This isn’t a new generalization, adherents of GTD and other productivity systems know that productivity is about your life, not just your work.
Tantek Çelik – The Acceleration of Addictiveness vs Willpower, Productivity, and Flow.