Short model, also called short description, means a system with a good deal of randomness and few rules could in principle be written in a short ideographic sentence. It also describes a morphogenetic model in which the rules restricting the random process are few and local in their scope. The lower proportion of possible relations specified by rules, the greater the morphological potential, and then more it will generate new forms. See: Long model.
Hillier, B. & Hanson, J. (1984), The Social Logic of Space, Cambridge University Press: Cambridge. pp.12-13; Hillier, B. (1996, 2007), Space is the Machine: A Configurational Theory of Architecture. Space Syntax: London, UK. pp.192