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"both broad and deep"

"Students in secondary school face choices and decisions that will determine the course of their lives. As they approach the end of required schooling, they must have the opportunity to explore their career interests—which may change during high school and later—and their options for postsecondary education. To ensure that students will have a wide range of career and educational choices, the secondary school mathematics program must be both broad and deep."

NCTM Standards, Ch. 7