This paper illustrates an application of soft system dynamics methodology (SSDM). SSDM arose as a fusion of two well-known methodologies in the systems movement: system dynamics (SD) and soft systems methodology (SSM). SSDM includes 10 steps to orchestrate and implant change in social systems, based on a multimethodological and multiparadigmatic approach as an outcome of the combination of the mentioned methodologies. After a brief introduction, the paper starts by briefly explaining SSM and SD, their stages and their problematical issues as systemic methodologies, then goes on to explain SSDM, its philosophical roots and stages, ending with a comparison among the three. It then introduces the citizen insecurity problem in Argentina, specifically in Mendoza Province, where SSDM was applied to analyze this issue. The paper concludes with an explanation of the learning points that arose from the use of SSDM in this study and suggestions for further research on citizen security and SSDM. © 2011 Springer Science+Business Media, LLC.