Bosworth (forthcoming) refers to a meta-analysis by Kling (7995) which considered the impact of three specific working practices—training, compensation linked to worker or firm performance, and employee involvement in decision making – across a number of predominately US studies. Kling concluded that all three practices seemed to improve labour productivity and were complementary in their effects – that is, that systems of interrelated practices had greater impact than the sum of practices adopted independently. Table 1 is reproduced from Bosworth.