How we deal with clients and how they view our professionalism is sometimes more important than what we know, especially in the field of User Experience where our knowledge is treated at about the same level as a fortune teller. I've told some of my reports that likable and professional is more billable than  knowledgeable.

I asked this question over at LinkedIn (I've grown to like the site, and it really is a powerful networking tool). I'm going to publish some of the answers every week, and you can respond to them, or not. Sometimes the answers will repeat – my apoligies. I will give credit where credit is due, and I'm going to try to live by some of these.

This was submitted by David Coerchon:

• Not delivering
• Involving himself in the customer’s company internal issues
  
• Not listening
  
• Thinking the project might last forever
  
• Not thinking to learn for the next project
  
• Thinking it’s over when he leaves the customer