This paper is concerned with the nature of rationing in intensive care. It reports a study of three intensive care units (ICUs) where resources were limited. We describe two conceptualisations of rationing: hard rationing, where there are absolute physical or financial constraints in place and soft rationing, in which clinicians and clinical managers, key actors in the organisation, can relax or remove apparently binding constraints. This paper demonstrates that, for the ICUs in this study, soft rationing was the norm. The existence of soft rationing was a function of three main factors: the nature of intensive care, the current state of modelling of means-end relationships in intensive care and network activity within and between ICU teams.