For managers, optimism may seem like a great trait to have: A boss with a
can-do attitude motivates others and makes them feel good. But there’s a
downside too. An excessively positive outlook on a tough project may
give the impression that you think the work is easy and doesn’t require
any struggle. And, when you aren’t concerned about or dismiss the
problems your team faces, it leaves others to worry about those risks.
You might also send the message that mistakes and failure are not an
option because the work should be a breeze. Wise managers know that
missteps are inevitable, and that failure is just the price of
creativity. So next time you want to ask your team, “How hard can it
be?” reconsider whether you’re being overly optimistic.
Adapted from :
http://blogs.hbr.org/cs/2013/05/your_optimism_might_be_stifling_your_team.html