Abstract
Recently I suggested that a cause is an event which, in its context of occurrence, is both necessary and sufficient for the effect. However this definition is only appropriate if there is a single potential cause of the effect. Consequently I suggest a generalization of the definition and discuss the resulting “Production Theory”. I suggest that this can be seen as a combination of a regularity theory in the Hume tradition and a dependence theory in the Lewis tradition, and argue that the Production Theory inherits the strengths of the component theories while avoiding their weaknesses.