Thinking and Speaking) establishes the explicit and profound connection between speech (both silent inner speech and oral language), and the development of mental concepts and cognitive awareness. Vygotsky described inner speech as being qualitatively different from normal (external) speech. Although Vygotsky believed inner speech developed from external speech via a gradual process of internalization, with younger children only really able to "think out loud," he claimed that in its mature form inner speech would be unintelligible to anyone except the thinker, and would not resemble spoken language as we know it (in particular, being greatly compressed). Hence, thought itself develops socially.
With the release of Boyd’s Aerial Attack Study, pilots realized that the high-stakes death dance of aerial combat was solved. Boyd said that a pilot going into aerial combat must know two things: the position of the enemy and the velocity of the enemy. Given the velocity of an enemy, a pilot is able to decide what the enemy is capable of doing. When a pilot knows what maneuvers the enemy can perform, he can then decide how to counter any of the other pilot’s actions. The Aerial Attack Study contained everything a fighter pilot needed to know.