Reflective journals have proven to be an extremely successful learning and self-improvement tool well more than a century. Used by top universities around the world, this tool is backed by a ton of research about the benefits they provide.
Specifically, in the field of education, reflective journals provide:
It was then only a matter of time till we integrated this technique into our Educational Program. And here it is - Path Journals. You can read all about them in the linked wiki entry.