Since I am into training for the last 17 years, obviously your post attracted my attention. However, you could have given little elaboration on the nature of your query. Are you student or working professional? If latter, are you training manager or external trainer? What is the context of your query?
After browsing Google, I came across with few articles. The basic premise of the model is as below:
70% of learning is experiential. It happens through daily tasks, challenges and practice.
20% of learning is social. It happens with and through other people, like coworkers.
10% of learning is formal. It happens through structured training courses and programs.
In Wikipedia, there is article on this subject. The article includes criticism also. You may click the following link to refer it:
My observation: - My observation is that the model does not talk about self-learning and self-motivation. For a well-motivated employee or worker, the percentage break up could be different. I have conducted hundreds of training programmes. In my training, I could very well found out that the participants are attending as a matter of discipline. They lack willingness. With the unwilling mind, whether it is experiential learning or social learning or formal learning it does not matter. For further queries, feel free to contact me.