After the product is shaped by the designer, one next step in design is spending time thinking about how to divide that shape smaller parts. For example, car designers struggle to decomposed a car body into panels and carpenters spend time calculating the spacing of siding for a house. In this study we explored decision-making as it relates to shape decomposition of a physical product. We assume that with digital fabrication not all shapes need to be divided equally and that it is possible to work with non-uniform shape decomposition. We questioned the ways in which a designer may reason through these decisions and ways this decision making process can be incorporated into new physically based CAD tools.