Using Six Sigma in the Management of City Logistics Processes: A Case Study on the Impact Assessment of Transport Infrastructure on Fuel Consumption in Szczecin

Purpose: The objective of this paper is to present the possibilities of using the Six Sigma (SS) methodology in the management of city logistics processes in the Polish city of Szczecin. Design/Methodology/Approach: The Six Sigma methodology is used in this study. We discuss the possibility of managing city logistics based on the Six Sigma methodology. In the first stage, the city logistics processes are analysed, and the customer of this process and their needs are defined. For this purpose, a SIPOC (Suppliers Inputs Process Outputs Clients) diagram is used, as well as a CTQ (Critical to Quality) tree. Subsequently, an overall concept for the management of city logistics processes is developed. Findings: Based on the literature review, possible process evaluation indicators are proposed. Finally, an example of a Six Sigma project is presented, to improve the city logistics process in the city of Szczecin in Poland. Practical Implications: The presented research results show the possibility of using the Six Sigma (SS) methodology in the management of city logistics processes. Originality/value: The Six Sigma management concept in city logistics presented in the article is the first study of this type according to the authors' knowledge. The in-depth analysis of the literature on the subject, presented in the article provides for a possibility of applying the Six Sigma methodology in logistics processes and in city management. The management concept according to Six Sigma has not been previously applied to the management of city logistics processes to the authors' knowledge.