Class Multiplication

What happens to a human body when its cells stop multiplying, stop producing new cells? Death. What happens to a church when its cells stop producing new cells? The same--death.

The cells of churches are small groups/Sunday School classes. Small groups include work groups, support groups, discipleship groups, and Sunday School classes/small group Bible studies. When those cells stop multiplying, church death begins. These classes often stop growing before they stop multiplying.

What is it that leads to this lack of growing to be like Christ and growing new relationships? What is it that happens in classes leading to the lack of preparation for multiplication? Could it be the lack of a vision (not just human vision but God's vision) for the class? What can a teacher, Sunday School director, or pastor do to spur growth and multiplication?