Gliatis, V., Minis, I., Lavasa, K. M.

Accepted for publication in International Journal of Quality & Reliability Management, vol.30, n. 1, 2013, 23-46

Abstract
Purpose – Failures represent an important source of variability in service operations and a major performance challenge. As a consequence, the effective management of failures is a prerequisite to achieve lean services. In this paper we focus on the operational perspective of failures; that is we attempt to quantify the impact of critical failure parameters on key system performance measures, such as cycle time and work-in-process. We also analyze various operational concepts, or management practices, that service organizations use to address the effects of failures.
Design/methodology/approach – We use discrete event simulation to model the behavior of a typical two-stage service system (front-office, back-office), and design of experiments to estimate the impact of significant parameters that characterize service failures, on key system performance measures. In a final experiment we analyze three of the most common practices used by management to address failures, and the impact of these practices on system performance under different conditions. The findings are validated through a case study in the post trade financial services.
Findings – The results of this study suggest that failures and rework degrade the performance of service systems. This adverse impact is reinforced, if specific inputs of the system deteriorate, such as the ability of the service organization to deliver appropriate quality, to detect failures early and to be capable enough to recover timely and efficiently from failures. In addition, the results show that typical management practices used to address the impact of failures have strengths and weaknesses depending on the characteristics of both the service system and the failures. If this is not taken into consideration, the above managerial practices may lead only to short-term improvements, while the main causes of failures will remain unsolved.
Originality/value – Analyzing the impact of failures in a service environment is a challenging task. In this paper, we complement the existing literature on service failures by focusing on the related effects on operations. With the use of simulation, we quantify the impact of failures on key aspects of operations of the service system.  We also provide useful insight into the parameters that determine the effectiveness of various management practices used in practice to address failures. Finally, we use a case study in financial services to validate our results.
Keywords: lean services, service failures, quality in service operations
Paper type Research paper

G. Kapetanvasileiou

Organization of Service Systems Using the Design Structure Matrix, Diploma Thesis, September 2011

This diploma thesis provides a methodology for assessing organizational structures in service operations using the Design Structure Matrix. We also introduce a systematic approach for the design of cells in services. An overview of service characteristics and differences with manufacturing is presented, highlighting sources of variability in service operations. Subsequently, we investigate the factors that play a decisive role in the selection of service organizational structures, and present the different structure types. Lastly, we adapt the Design Structure Matrix methodology in order to assess and design organizational structures in typical service settings. The approach developed reduces system’s complexity considerably and facilitates the design of service cells.

Key words: Design Structure Matrix, Organizational Design, Cellular Manufacturing