You've got a good idea. You know it could make a crucial difference for you, your organization, your community. You present it to the group, but get confounding questions, inane comments, and verbal bullets in return. Before you know what's happened, your idea is dead, shot down. You're furious. Everyone has lost: Those who would have benefited from your proposal. You. Your company. Perhaps even the country.

It doesn’t have to be this way, maintain John Kotter and Lorne Whitehead. In Buy-In, they reveal how to win the support your idea needs to deliver valuable results. The key? Understand the generic attack strategies that naysayers and obfuscators deploy time and time again. Then engage these adversaries with tactics tailored to each strategy. By "inviting in the lions" to critique your idea--and being prepared for them--you’ll capture busy people’s attention, help them grasp your proposal’s value, and secure their commitment to implementing the solution.
(text cited from www.amazon.com)