Most people are fascinated about stammering. They ask me what causes it and what they should do when people stammer. I tell them that stammering is a multi-factorial condition that is caused by a predisposition to it due to the wiring in their brain. If you are not sure what to do when people stammer I would advise you to just allow people to talk, just like anyone else. Be patient, kind and authentic. If you are not sure, you could always ask them!