I happen to believe quite strongly in this as an area that managers or leaders of teams must be well versed in. I am a store manager who runs a store with a team of around 50 people and quite often I find it useful to remind my management team that "if you are not willing to do something, or not able to do something yourself' please do not ask others. If there are any managers out there, what do you think? If you were short staffed - would you be capable of filling one of the staff roles? Would you do it as well as they would?