Using qualifiers such as "I think" or "we might" or "I hope to" before your points. It lacks confidence.

FIX: Start paying attention to how you use language, and if you're hiding behind qualifiers. Tape yourself or ask a colleague to take note of when you use them, and find a comfortable phrase to replace them such as "I plan to" or "I will."

This norm serves a great purpose in that bad ideas can be debated and debunked. However, it also kills a lot of good ideas as well. 

FIX: Stop yourself from first pointing out what's wrong in a situation, and make it a habit to jump to what's right instead. 

If an idea is simply rotten, say how much you appreciate the thought or effort, and explain why you feel it falls short and how it can be improved. If you kill it, provide an alternative.

This occurs when we want so much to be a likable team player that we come across as a yes person. Every idea is great, each deadline is possible, and new projects are all upside.

FIX: When you find yourself tempted to state agreement even though you don't feel it, express your true opinion. You can still say this politely, and rather than simply say what you can't do, let the person know what you can do, and believe to be the best solution for all.