Four elements of a model of effective instruction are instructional Quality; Appropriate levels of instruction; Incentive; and Time. In the QAIT model, all four elements must be adequate, and improvements in multiple elements may produce larger learning gains than improvement in any one. (SK)

Discusses alterable elements of classroom organization, traditional approaches to instructional improvement, and "component building," an alternative approach to education. The component-building approach involves an extensive program of field experimental research on classroom practices that are or could become components of complete…