Speaking personally, the biggest challenge with multiple projects is the ease with which you can switch from one to the other and still feel productive. Encoun

Speaking personally, the biggest challenge with multiple projects is the ease with which you can switch from one to the other and still feel productive. Encounter something unpleasant that needs to get done? Switch and work on the other project. I've done this in the past and the results are (a) everything moves slower, (b) I have less motivation to tackle the stuff I want to put off, and (c) there is a very high switching cost (in terms of time) that I pay. Multiple projects are good (and critical for me personally) but they definitely come at a cost. I think I'd prefer a plate spinning analogy to juggling. Focus on keeping one plate spinning and only divert your attention when another plate is about to fall. If you try and touch every ball frequently (with the juggling analogy) its hard to make substantail progress.