The complexity of planning and scheduling, that its activities are comprised of and influenced by technical and social aspects, has been highlighted in earlier studies. The objective of this paper is to assess how the outcome of the production scheduling processes in four companies is influenced by human, technological, and organizational aspects. A conclusion is that the outcome of the scheduling process is influenced by the scheduler adding human capabilities that cannot be automated, problem-solving when the technical system fails, and negotiating between groups of employees to handle incompatible goals. Technology influences by limitations in the scheduled production system as well as the scheduling tools available. The organization, finally, influences the outcome through degree of proximity between employees, meeting structures, the schedulers’ position in hierarchy and their work role interconnecting activities of different organizational parts.