Two of the most widely adopted models of human resource management are the hard and soft versions. These are based on opposing views of human nature and managerial control strategies. The hard model is based on notions of tight strategic control, and an economic model of man according to Theory X, while the soft model is based on control through commitment and Theory Y. We argue that because these assumptions are so divergent, they cannot both properly be incorporated within a single model of human resource management.

Catherine Truss, Lynda Gratton, Veronica Hope-Hailey, Patrick McGovern and Philip Stiles (1997). "Soft and hard models of human resource management: a reappraisal." Journal of Management Studies, 34(1), 53-73.