Recently took the course in accident investigation with a view to getting some paperwork to back up previous skills and experience. I've done a number of AI over the years yet still found this course informative and thought provoking. It has added deeper understanding to my knowledge in this subject and has enhanced my capability. It took me less than a week to complete but don't let that detract from the value of the course. It is worth it. It's not difficult. Just get on with it.