This study examined the moderating role of environmental uncertainty on the connection between logistics flexibility, relationship flexibility, and logistics service quality. This study covered large and medium- sized companies operating in the Gaziantep Organized Industrial Zone. Company lists were created based on records in the Gaziantep Chamber of Industry. A questionnaire was sent to a total of 1627 companies by e-mail and company managers were asked to fill in the online questionnaire. The managers of 356 companies fully completed the questionnaire. SPSS Process Macro V3.4 was used to calculate the moderator effects of environmental uncertainty. The macro also reported the effect level of independent variables on dependent variables. According to the results of the analysis, logistics flexibility and relationship flexibility affected logistics service quality, positively and significantly. Besides, environmental uncertainty had a moderator role in the relationship between logistics flexibility and logistics service quality. There were some limitations. A questionnaire was used as a data collection tool in the study. Thus, personal perceptions of the participants could be apparent in the information given about the company since questionnaire data was formed in accordance with statements given by the respondents. In future researches, it is recommended that measurement tools that can determine environmental uncertainty more objectively could be used on a sectoral basis to secure clearer results. It is recommended that companies take into account environmental uncertainty when determining a strategy(s) to enhance the quality of logistics services.

The aim of study is to investigate the mediator role of logistic service quality in relation between relationship flexibility and relationship. In order to get data, a questionnaire form was sent to 1627 business managers registered in Gaziantep Chamber of Industry and 366 of them returned. According to the results of the analysis made with the data collected, it was found that the relationship flexibility positively affects the logistics service quality and the logistic service quality to the relationship satisfaction. However, it was observed that the the relationship flexibility did not affect the relationship satisfaction significantly. In addition, Sobel test was applied to determine the mediation effect and the mediation role of logistics service quality was determined in the effect of relationship flexibility on relationship satisfaction.