is a model of human movement in human–computer interaction and ergonomics that predicts that the time required to rapidly move to a target area is a function of the distance to and the size of the target.
P. Seddon, D. Staples, R. Patnayakuni, and M. Bowtell. ICIS '98: Proceedings of the international conference on Information systems, page 165--176. Atlanta, GA, USA, Association for Information Systems, (1998)