I have found that there’s a simple test for whether you are learning in your career. Look back 3–5 years from today and ask yourself if you could have been substantially more effective at your past job in your present form. If you look back a few years and feel like in comparison to who you are today, you had little idea of what you were doing and would have done things a lot differently given what you now know, that’s a telltale sign of learning and growth.
Larry Cheng of Fidelity Ventures – The Learning Test « Thinking About Thinking.