Abstract
This paper introduces the idea of the ‘HR quadriad’ as a framework for the analysis of HRM as a collective, configurational, and complementary system of roles and practices. The framework highlights the interplay between HR specialists, line managers, project managers, and project workers in the implementation of HR practices. On the basis of a multiple case study comprising six project-based organizations, two organizational factors are singled out as important for the design of the HR quadriad: (1) the nature of project work as either intra-functional or inter-functional, and (2) project participation as either focused or fragmented. The paper gives empirical support to recent research on HRM favoring the synergic integration of the elements of HRM systems designed in a way that acknowledges internal coherence and organizational conditions.