The purpose of staff development

I came across this quote in a book by Richard Dufour, The Principal as Staff Developer, and it says better than I what the goal of staff development should be.

The ultimate goal of training programs is not to create individuals who unthinkingly follow a cookbook approach to teaching, but to develop thoughtful professionals who have the ability to assess and revise their own actions in order to improve the likelihood of success for their students.

Quality staff development is about thinking and learning.