I attended a very inspiring talk by Karen Schmidt of Let's Grow!

Karen is a motivational speaker who made the observation that a negative person in the office is like that one bad raspberry in the punnet.

They infect the others around them, slowly but surely, until all the raspberries in the punnet have gone off.
 

Recently, I was asked the question:
 
"We are considering the use of 360-degree feedback as a key component of our leadership development programme. I need to gain buy-in from our senior executive team that addresses the return on investment for using 360-degree feedback in our development programmes. Do you have any tips?"