Axiomatic Design (AD) Theory describes the design process as a mapping of ‘what’ to ‘how’ across four design domains. Every decision during this process is made deliberately, from the highest-level functional requirements to the lowest level process variables. However, it is unclear how and where to document that information within the AD framework. This paper investigates where and how the goals, motivation, values, and rationale of a design project – the ‘why’ – are, could, and should be specified within AD. It presents three options for where to find the goals and motivation (the highest-level ‘why’) of a design project. It explores the various ‘whys’ associated with the requirements and mapping and decomposition processes. The design domains are then viewed as a whole and a new model that defines the relationship between ‘why,’ ‘what,’ and ‘how’ information in AD is presented.
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