Motivation – The Recognition Primed Decision-Making model (RPD) (Klein, 1999) has been used to describe Design Decision-Making (DDM). Originally the RPD model was a multi-stage model but it has matured into three variations to better describe differing situations that one could encounter. These variations have not been reflected in the DDM literature. Research approach – Theoretical Thematic Analysis was conducted, based on six semi-structured interviews with Interaction Designers. Findings – Three themes were identified: 1) the use of analogies, 2) the impact of constraints, and 3) the use of mental simulation. Value – This study aims to update the current understanding of DDM to be more in line with the current NDM literature. Take away message – The third variation of the RPD model is best at encapsulating the DDM process exhibited by participants, although none of the variations could account for results such as the persistence of the initial analogy.