I agree that the planning phase is one of the most important phases and is extremely critical on the success of the project. However, the planning phase will just set up the guidelines and time schedule for the project and it is up to the other phases and groups to execute. I think the execution phase is a lot more important because planning is great but it your team can not effectively act out the desired tasks then the project will slow down and could possibly fail. If a lot of time is spent planning a project and then a couple unexpected changes, the project can become dismantle and project management will be forced to revise and possibly start over. Therefore, I think amble time should be spent in planning to set up a solid foundation but it should not consume too much time as acting out and executing the plan is just as important, and there should be enough time left for the execution phase to work so that they can properly handle changes. Also, putting too much time into the planning phase will make the team too committed to the process that they may not be willing to go back and revise certain areas.