The task of arriving at an engineering decision typically involves extensive and complex analyses, the evaluation of alternatives, and the resolution of conflicts between stakeholders. Research into institutional frameworks, decision making, and decision support tools have guided improvements in the quality of decisions. However, existing organisational structures and decision frameworks must be acknowledged and addressed if the desired improvements are to be realised. A mapping technique is proposed that allows the existing decision-making processes and information flows to be identified and analysed. The result is a mechanism to understand the context and processes of the decision task, and ultimately to aid in the introduction of new decision protocols and decision support systems.