Great planning led to failure

Given the task at hand, me and the team decided to follow the typical procedure of planning. Step one is to define your goals and objectives. Our goals and objectives were clearly given by the professor. Our goal was to give a secure base to an egg so that when we dropped it from approximately 10 feet high into the garbage bin, it would not break. In step two, we looked at our resources which were eight regular drinking straws and about three feet of tape. When giving out positions we picked the shortest person to drop the egg, so that the height would have shortened from which the egg was dropped to reduce the amount of force our object would encounter when hitting the bottom of the garbage bin. Then we went around the group asking each person what they think about how the egg should be secured, which would constitute as step three. Some ideas were dismissed given the proper explanation of why it might not work, and others were considered. Then we picked the best one as a team. The design was very good. As we got our resources, and as we started putting things together we fell apart. People were innovating and focusing on things that were not supposed to be innovated or focused on as much. The execution was terrible on or team, even though the design was very good and would have most likely worked. If I was to take back time, I would have clearly stated which things were more important, and on what we needed to focus most our time on.