A company should regularly check and decide which products should be made and which services should be executed by itself and which should be bought from outside (Coase 1937; Penrose 1959; Williamson 1985). This holds true also for logistic services. The make-or-buy-decision for logistic services depends on the goals and core competencies of the company, on the kind and extent of the required services and on the available logistic service providers (Barney 1991; Coyle et al. 1996; Peteraf 1993; Van Damme and Amstel 1996).