The Big 6+6 was originally developed by Dr. Eric Haughton, a fluency-based instructor.

Here’s a great blog post about it:

https://theautismhelper.com/functional-motor-skills-the-big-66-skills/

Here’s a research article on it if you are interested:

https://www.researchgate.net/publication/246909135_The_effects_of_fluent_levels_of_Big_6_6_skill_elements_on_functional_motor_skills_with_children_with_autism