There are Advantages in Working in a Small Group
Responsibility to Yourself
When you are in a small group, failing to contribute is the same as "Shooting yourself in the foot." When you fail to work in a group, the result will not be as good as when everyone works. And because you all get the same grade, then your grade will be lower. BANG! OUCH!
Responsibility to the Group
If you don't help to make the results better, then the grade may not be as high, and that hurts the other members of the group. They other group members won't like that!
Contributing to the Group
Don't hold back. Sometimes ideas that may seem silly will stimulate someone else to come up with a good idea. This is one of the powers of a small group. This is why we never make fun of another person's idea!