 According to Lange (2000, 2002, 2005), the universal fundamental laws in physics and the cp-laws in the inexact special sciences differ only in degree (for a related account that does not focus on stability alone see Mitchell (2000)). The lawhood of universal laws and cp-laws is due to the same property of these statements: their stability. Lange’s (2000, 8f.) approach consists in two steps. First, the role of laws in scientific reasoning is determined: they figure in explanations and predictions, they support counterfactuals, and they are inductively confirmed. And second, it is claimed that the laws can play this role because of their characteristic stability. So, in order to understand Lange’s account of cp-laws, we must first clarify the crucial notion of stability.