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Dimension involves adaptations to instruction , environment , and curriculum materials and topics that can be made at the later stages of a teacher 's involvement with implementation . The " model student " is usually the one to take up the teacher 's agenda and participate in the way that the teacher expects . It came from the National Council of Teachers of Mathematics - which is not a teachers ' union or another department of education composed of professors who have n't actually taught a child in years . Ongoing sessions of learning , collaboration , and application , accompanied by school - and classroom-based support , over an ample time period are necessary to incorporate new behaviors fully into a teacher 's repertoire . In connection with this , the teachers ' perception in as to the little importance of education on aging matters for the medical profession could be linked to certain degree of ageism .