Systematic Instructional Design era
Robert M. Gagné, renowned for his Conditions of Learning and the Nine Events of Instruction, anchored systematic design by prescribing the sequencing of objectives, learner characteristics, and instructional events. Walter Dick and Lou Carey, in The Systematic Design of Instruction (1978), formalized instructional systems design with a stepwise model that tightly aligns goals, content, delivery, and evaluation. Benjamin S. Bloom's taxonomy of educational objectives provided the objective-level granularity that guided performance targets and criterion-based assessment within this design stance. Together these figures established the normative standards for theory-to-design-to-evaluation linking and inspired early explorations in cognitive-diagnostic approaches and machine-assisted tutoring that aimed to personalize instruction.