Who? When? For whom?

When something is to be done, there are three central questions I got from a presentation done by Viktor Frankl many years ago. I sometimes remember them and then find them very useful:

1. Who should do it?
   Should you do it? If you will not do it, who should it?
   
   
2. When should it be done?
   If you will not do it now, when will you do it?
   
   
3. For whom should it be done?
   If you do things only for yourself, who are you then?

Related post: The main purpose.