Checklists help bridge the gap between the steps a task requires to be done in sequence and the limits of our short-term working memory.
A checklist is not a training tool in itself. Training must be developed to teach people the how and why behind each of the checklist items. With that training in place, it can be used as a management and coaching tool to teach people how to ask the right questions of themselves and others.
Checklists improve change order management as well as labor productivity.
Check out the book The Checklist Manifesto