Miscommunication...

seems to be the major (failing-)factor when it comes to efficient planning and organization of social groups.

I remember the day when my Track and Field team was supposed to depart for a competition and either of the two parents who were in charge for transportation thought that the other person would take us to the meet. After several calls the confusion was clarified and the group was able to get to the competition. However, we were late and some athletes were really nervous about not having enough time to warm up which led to some average performances.

I believe that miscommunications like that are unnecessary and easily preventable. Structured planning that is reported on a written plan could prevent miscommunication and would clarify everybody's responsibilities within a group.