This paper empirically tested the relationship between creativity and computing tools in two different architectural practice settings: one that extensively uses parametric tools for design and fabrication and another that predominantly uses conventional CAD tools in design. The paper surveyed 14 parametric practices and 17 non parametric practices from the UK. The results were statistically analysed using IBM_SPSS (Statistical Package for Social Sciences). The analysis of variance between the 2 groups revealed significant differences on the four domains of creativity. Statistical variance between the two groups on originality was big. Also the length of time subjects used parametric tools correlated significantly with three measures of creativity (fluency, variety and elaboration). Cluster analysis on design cognition of the two groups showed significant pattern differences on how each group structures the design process.