JDMurray said: With me it starts with an interest in something that I don't do at work (e.g., digital forensics) or will soon become very important at work (e.g., anything "Cloud") that I want to get a head start on learning. There is also the occasional thing that just grabs my obsession (e.g., Sanskrit written language) and I find myself stealing time from other projects to learn it. However, most of the things I go about learning do not result in a degree, certification, or a worthwhile mention on my resume/CV. They just keep my brain active and moving forward. I never consider such spontaneous learning a waste of time because I may not understand now how it will fit into my future.