Rankin, R. O. (1989). The development of an illustration design model. Educational Technology Research & Development, 37(2), 25-46.

A method is described for isolating factors which influence the ability of a reader to comprehend the message of an illustration. It is suggested that a flow chart or model can be constructed from these factors to highlight potential problem stages in an author's design of an illustration. The model is constructed using data from comprehension trials and critical commentary with readers, incorporating a set of factors which would be of use to prospective authors of illustrations. The procedure is largely non-experimental and intended to demonstrate a procedure for model building.