A gap model of purchasing's internal service quality: Concept, case study and internal survey

Traditionally, the monitoring of a purchasing department's performance is primarily focused on cost analysis and the evaluation of suppliers rather than on internal service aspects. Therefore, the main objective of this paper is to develop an instrument for the measurement of the internal service quality of purchasing departments. Based on the SERVQUAL and the general gap model of service quality, a specific gap model regarding purchasing's internal service quality was developed. Similar to previous research, both the perceptions of the actual service and the internal customers’ expectations of the service quality were included. In addition, the model contains a self-evaluation by contrasting the views (expectations and perceptions) of the internal customer with those of the purchaser. The application of this instrument in a large company demonstrates the general usefulness of this instrument. Statements of 145 internal customers and 36 purchasers were available for statistical analysis. The results of this analysis can be helpful in detecting weak points and sources of internal customers’ dissatisfaction.