The best idea can still die when naysayers raise concerns, even if the concerns are meritless. Instead of trying to dodge unavoidable attacks, learn to expect the common types you'll face, and how to counter them simply and convincingly:
Death by delay: Adversaries may try to put off the discussion, ask for additional information, or otherwise delay a decision on your idea, thereby slowing momentum. Keep your audience focused on making a decision.
Confusion : Detractors often present distracting information or try to link your idea to several others in an attempt to confound people. Be clear about what your idea is and what it isn't.
Fear mongering: Nothing kills an idea faster than irrational anxieties. Know what fears your challengers might stir up and be prepared to allay them.
Courtsey : John P. Kotter and Lorne A. Whitehead./ Havard Business Review