I've been on the wrong end of #4 a couple of times. My boss' opinion of what is "interesting and really challenging" rarely coincides with my own opinion. By th

I've been on the wrong end of #4 a couple of times. My boss' opinion of what is "interesting and really challenging" rarely coincides with my own opinion. By this criteria, "make me a Facebook" or "solve the bin packing problem in linear time" would be perfect tasks! And yet I can't imagine many developers jumping for joy when assigned to them.