“…In comparison with testing an existing theory (Popper 1959) or developing a new theory (Glaser and Strauss 1967;Eisenhardt 1989), the key idea of theory elaboration as applied in this paper is to extend the IPF to the global sourcing context, thereby providing theoretical explanations for the use of different integration mechanisms across different categories. The (1) Purchase novelty Experience the firm has on purchasing the item: new task, straight rebuy or modified rebuy New tasks are more uncertain because the firm does not have the experience and knowledge of the purchase Cardozo (1980), Hill (1972, McQuiston (1989) (2) Product complexity Degree to which the product is a commodity or highly customized Customization increases the understanding of product characteristics and purchasing process, making the situation more uncertain Hill (1972), McQuiston (1989), Xideas and Moschuris (1997) (3) Purchase importance Degree and type of risk perceived in the purchasing situation and purchase volume High volume and risk increase the exposure to loss, making the purchase more uncertain Cardozo (1980), Hill (1972), Bunn (1993) (4) Demand volatility Degree to which the demand of the purchased item changes across periods Strong demand fluctuations make the planning of purchase difficult, increasing uncertainty of the situation Walker and Weber (1984) (5) Supply market characteristics Degree of global availability of the item, uncertainty in production and supply, stability of supply A turbulent environment characterized by a rapid rate of change and lacking transparency of supply markets, making the situation more uncertain Cardozo (1980), Bunn (1993), Xideas and Moschuris (1997) outcome of the paper can therefore be classified as middle-range theory (Merton 1968;Bourgeois 1985;Layder 1993) which is defined as theory that generalizes beyond a particular case but within a particular context or setting (Woodside, Liukko and Vuori 1999;Ketokivi 2006).…”