I think Planning and execution is one of the most important task to achieve the goal of the project. If the things are planned properly it can be executed in a right direction. I had a project in in my undergrad where we were in the group of three and duration was three months, there was lack of planning about how to proceed with the project. There was lack of communication and planning so there was less time to design the device which I was planning to design as we were approaching the deadline of the project. So I think planning and coordinating with the team members is one of the most important factor to complete the project successfully.