This reading paper presents five case studies developed in cooperation with Ariba Inc. to investigate how specific categories are sourced. Readers with basic purchasing experience will find a rich source of market and sourcing knowledge for steel, fleet management, janitorial services, commercial print and injection molded plastics.

An issue for companies in globally competitive markets is to adapt their organizational structures and governance in increasingly complex organizations. At the functional level of purchasing, companies are turning to hybrid purchasing organizations in order to leverage global sourcing benefits. One of the key challenges in this context is to distinguish between categories to be integrated across sites and those that are to remain under the authority of each purchasing location in order to maximize purchasing synergies.This paper presents a purchasing portfolio model that provides a comprehensive view of relevant global synergy dimensions. Based on a literature review, a theoretically-grounded purchasing portfolio model for global sourcing is developed. The theoretical basis stems from information processing theory, organizational buying behavior (OBB) and transaction cost economics. The validity of the model is explored by means of case study research. Complementing the extant literature, the theoretical contribution of the paper lies in not only addressing category selection criteria for exploiting economies of scale, but also for economies of information and learning and economies of process. Furthermore, it provides insights regarding integrated network coordination mechanisms at the functional level of purchasing. (C) 2009 Elsevier Inc. All rights reserved.

Global sourcing refers to the integration of decision making across worldwide purchasing units within a multinational corporation (MNC). In order to manage the integration challenge, firms have a number of tools, varying from centralization and formalization to cross-locational teams. In this paper, we focus on explaining how and why to integrate in different circumstances. The aim of this paper is to complement prior research on global sourcing organizations, which is still rather scarce and more exploratory in nature. By extending the arguments of the information processing perspective of organizations to the global sourcing context, we seek to propel a theoretical discussion on integration in the global sourcing organization. Based on the results of 12 case studies in three MNCs, we propose that integration approaches in global sourcing organizations vary depending on the three contingencies of category characteristics, supply environment characteristics and interdependence of the purchasing units.

Global sourcing has become an intended practice for many multinational corporations. Organisational design implications of global sourcing are rarely considered although they are one of the main facets of a global sourcing strategy. By elaborating on the information processing perspective of contingency theory, we derive explanations for the application of different control mechanisms in the global sourcing context. Our findings from case studies at eight multinational companies suggest that variations in control mechanisms can be explained by two contingencies: (1) corporate organisational structure and (2) the distribution of purchasing expertise among subsidiaries. Based on these case study findings, we formulate ten propositions for future research.