Spaced-Ed was launched in 2010 after three years of development.
It is a product of the Harvard Medical School and was created by Dr B Price Kerfoot a graduate of Harvard and Oxford.
The initial problem was to improve the poor results being achieved by urology students, who like all medics, must learn and retain a great of accurate information on the human body. Research, testing, then building a system that would deliver spaced multi-choice questions via email resulted in the development of www.spaced-ed.com.
Here's an idea of the frames you work with.