Dave Chase posted this as a comment to another post, but it's an excellent link to a great presentation on the "Sales Learning Curve", so I'm bumping it up from the comments section. Thanks.
Link: CEO Briefing with Mark Leslie.
Our guest speaker, Mark Leslie, presented on "The Sales Learning Curve - Why it Always Takes Longer and Costs More" at the Columbia Tower Club on January 28. Mark, currently a professor at Stanford Business School, is working with Altus Alliance to study the stage of growth between new product release and the revenue inflection point - a critical point in the growth of any business.