During one project I was on at my company, the WBS wasn’t executed well. One particular mechanical engineering team was overloaded with many tasks, the other teams had a more reasonable workload. The reason for the overload of tasks was because of what that team specialized in, which this project saw a lot of what they did best. Delayed progress and lack of communication since they were always in the lab working, caused some frustrating situations during this project. Eventually to help ease off the workload, members were pulled from the other teams and assigned to them for assistance. I was one of the switched members. But even then, we had to brought up to speed before we could have been of any use. So it is very important to develop a well-balanced WBS for a project. If you can see that a particular branch will see a lot of work then it would be wise to adjust the WBS or acquire more resources.