Matt Perman, author of the forthcoming What’s Best Next making an incredibly helpful distinction:
Myth#1: Productivity is about getting more done faster
When most people think of productivity, they think of efficiency—getting more things done in less time. While efficiency is important, it is secondary. More important than efficiency is effectiveness—getting the right things done. Efficiency doesn’t matter if you are doing the wrong things in the first place.
Truth: Productivity is about effectiveness first, not efficiency.