What does it mean to be productive? Does it mean getting EVERYTHING on your To-Do List done? Does it mean doing more today than you did yesterday? Does it mean doing more than everyone else on the team does? Does it mean that all of your work was done perfectly? Does it mean that your desk is cleaned off at the end of the day?
I say it is none of those. It is the feeling of satisfaction at the end of the day and having a family that loves you no matter what kind of day you had.