The document discusses different types of professional development experiences and their effectiveness according to Joyce & Showers (2002). Presentation alone leads to 5% skill transfer, while adding modeling and demonstration increases skill transfer to 10%. Practice increases it to 20%, developmental feedback to 25%, and coaching and mentoring provides the biggest boost to 90% skill transfer when used together with the other experience types. The key finding is that each experience type is necessary but insufficient on its own, and combining all the experience types leads to the greatest skill transfer for educators.