Perhaps one of the more charismatic and unproductive investments made by the education community over the past 20 or so years has been on learning styles. If you total the expenditures on books, workshops, tests, teacher guides and other adjunct resources, I suspect the investment goes into the millions. So, what return has the learning community realized?
Guide to color affecting learners
Gagne's 9 events of learning as applied in eLearning.
Estimates for different phases of eLearning development.