The Kemp ID model is an instructional design model developed in 1985 by Jerrold Kemp that includes 9 key elements - instructional problems, learner characteristics, task analysis, objectives, content sequencing, strategies, message design, delivery, and evaluation - and views the design process as continuous and iterative; the model is classroom-oriented and focuses on considering all factors in the learning environment in a holistic and flexible way. An example lesson plan demonstrates applying the 9 elements of the Kemp model to design an instructional objective for students to sequence the 8 phases of the moon.