This paper discusses the formalization of Alternative Shaper, a Spatial Grammar supplemented with procedural knowledge for supporting design generation. The nondeterministic process style perspective supports an exploratory and flexible specification of designs and the use of predicates relating shapes allow the confirmation of shape spatial restrictions on design processes. Although simple at this stage, Alternative Shaper actually offers interesting potentialities on design generation that may be improved soon with convenient abstractions.

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This paper reports our current research on automatic generation of houses layouts according to future inhabitant's requirements. For that generation we propose the use of a design method based on shape grammars that encodes light wood frame construction guidelines. Two different implementations for the design system are presently under development. One based on shape grammars supplemented with procedural knowledge and another using a genetic algorithm. Both implementations allow the generation of house layouts that fulfill both the user requirements and the design language.