As Andrew points out, most of us tend to retain only 5% of what we hear in a lecture-type sermon/message. Yet for some reason this style is the most common form used.
Here is Andrew's graphic of how much is retained from various learning methods:
If there are more effective ways of communicating our message, why do we continue to favor the least effective forms? As pointed out in Andrew's graphic, other styles of teaching and learning are better suited for a higher retention rate.
Would you not agree that this study is an important consideration for those of us involved in making disciples? Preaching the Gospel? Teaching others? What are the implications? What must change in the way we "do church" to be more effective communicators of the truths of God's Word and building up one another in the Body of Christ?