Robert Gagné is considered to be the foremost contributor to the systematic approach to instructional
design and training. Gagne and his followers are known as behaviorists, and their focus is on the
outcomes (or behaviors) resulting from training. Gagné's book, The Conditions of Learning, identified
the mental conditions for learning. Gagné created a nine-step process called the events of instruction,
which correlate to and address the conditions of learning. See the nine events of instruction below: