The Vignette Model:

Opening (a premise):  A statement of opinion or belief; e.g., "I am convinced a speaker's primary role is encouraging an audience to do their own thinking and feeling."

Middle (Problem & Resolution): The challenge such a view brings and the resolution thereof; e.g., "I know there are some who disagree with this, those who think that what they have to say is more important than what their audiences think or feel... I would be, too... if I thought my views were universal, but they're not... not yet anyway. Until then I will offer my opinions for consideration, not unquestioned acceptance."

Closing (PayOff ): The personal benefit achieved; e.g., "For me, this yields two benefits.  First, I am not setting myself up as the sole authority and second, I realize others may not be either.  Not a bad situation to be in... when you think about it."

Summary: By stating an opinion then examining its positives and negatives before concluding with the reason(s) why it is held the audience is encouraged to consider its validity.