Write the next sentence in this paragraph:

How to measure the effectiveness of communication
Hear the responses listeners give you.
If your audience (be it one person or many) tells you they don't understand what you are saying, hear them. Many a good point is lost on listeners when a speaker refuses to stop pressing on with their speech to clarify a point they've made.
Stop and clarify what you are saying even if it means it'll take longer to make your point (s). Don't take yourself, or your ideas, too seriously.