The art of persuasion

This can be seen as basic salesmanship as we all have to convince someone at some point in our lives. It could be our parents, teacher, boss, customers, spouse or kids. Some of us do it very well, others do it so poorly that they never go far with it and soon give up.

I am not talking here about reciprocation or some other situations where the decision of the other party is either leveraged by something dubious like a threat or some form of manipulation. Instead, I am suggesting the sound argument made in favor of a worthwhile idea that may be little known but can bring appreciable benefits.

Do you make a big "splash" in presenting it or do you prepare your audience, take the time to let it percolate and try to make it germinate further in those very minds you want to turnaround? If the idea is rather complex, involves a big change, the latter approach might be the best. What are your thoughts?