Concentrated Sample Principle

The learner sees, especially early on, many more instances of fundamental signs and actions than would be the case in a less controlled sample. Fundamental signs and actions are concentrated in the early stages so that learners get to practice them often and learn them well.

For more details, see James Paul Gee. What Video Games Have to Teach us About Learning and Literacy (New York: Palgrave Macmillan, 2003).