Qualitative Aspects of System Dynamics Modeling

It is difficult to imagine a system dynamics study without any qualitative aspects. Defining the dynamic problem of interest, representing the causal structure generating the problem's dynamic behavior, and using the model to serve the purpose of the study all involve qualitative processes, elements, and decisions. The 17 papers in this Special Issue illustrate the richness and diversity of qualitative aspects in the field and show how thoroughly qualitative aspects are integrated into every stage of system dynamics practice from problem specification to model formulation and model use. They also present exciting ways people are innovating with qualitative aspects, advancing model use with diverse audiences, and thinking deeply about what policy makers, stakeholders, and clients need to best motivate action. The papers show general agreement about the definitions of “small” qualitative concepts, such as qualitative variables, qualitative data, and qualitative procedures and less agreement about the definitions of “large” qualitative constructs such as qualitative models or qualitative modeling. Overall, this collection lays the groundwork for further reflection about the value and practice of qualitative aspects of system dynamics and suggests some paths forward. © 2024 System Dynamics Society.