A MULTI-OBJECTIVE GENETIC ALGORITHM FRAMEWORK FOR EARLIER PHASES OF ARCHITECTURAL DESIGN A Case Study SERKAN KOCABAY 1 and SEMA ALAÇAM 2 1,2 İstanbul Technical University, Turkey 1,2 {skocabay|alacams}@itu.edu.tr Abstract. This paper presents an algorithmic framework proposal for implementation of a multi-objective genetic algorithm (MOGA) in ar- chitectural design process. Different than the previous studies, we in- troduce a dynamic and extendible modular framework for multiple ob- jectives. The objective modules with different fitness functions are con- nected simultaneously in the Rhino/Octopus interface, after multiplica- tion with a constant value or a variable. In this study, we discuss the po- tentials and limitations of MOGA in 3D form generation, implications of MOGA in a case study and the qualitative and quantitative changes in relation to the change of constant value/ the impact ratio of competing objectives. The outcomes of the case study are investigated based on its potentiality in providing feedback in the earlier phases of decision processes in design. Keywords. Multi-objective; genetic algorithm; architectural design process; case study. 1. Introduction Complexities in natural systems have been a source of inspiration for researchers throughout centuries, whereas some resulted with well-established theories and concepts. The change in the distance between the theoreticians and ongoing in- teractions of the nature, in other words, the tension between the theory and the observed reality, gave rise to both the emergence of divergent conceptualizations and their different interpretations in different disciplines. Being derived from the theory of evolution, genetic algorithms (GAs) may be considered as one of the no- madic concepts which gain different explanations in different contexts. Following John Holland’s first introduction of a genetic algorithm concept in 1970s (Gold- berg & Holland 1988), and John Frazer’s (1995) extension of the boundaries of the P. Janssen, P. Loh, A. Raonic, M. A. Schnabel (eds.), Protocols, Flows and Glitches, Proceedings of the 22 nd International Conference of the Association for Computer-Aided Architectural Design Research in Asia (CAADRIA) 2017, 293-303. © 2017, The Association for Computer-Aided Architectural Design Research in Asia (CAADRIA), Hong Kong.