If you are redesigning your web site, and have a team of people working on it, then its successful completion will require time, energy and most of all, a consensus. Putting one person on the redesign team in charge who has design and project management experience can make all the difference. Next is communication. Constant updates should be the name of the game when you have a team involved in a redesign. No message can be communicated too many times, say the experts.
Next is data and feedback gathering. You have to find out what site visitors want. For this information, consult your analytics data, along with collecting feedback from user forums and communicating directly with visitors. And no redesign should be without a timeline. Give your project a definite amount of time. With a deadline, your project can be kept in scope. Lastly, take the time to do it right rather than hastily. The small decisions and changes you make could have a big impact.