 Those who have pursued the SEF approach to providing an analysis of ‘actual’ causation – that is, the causal relation between actual, particular events – have had very little to say about the semantics of the counterfactuals that underpin SEF. Some authors (e.g. Hitchcock 2001) explicitly – and many authors implicitly – assume a broadly Lewisian approach to counterfactuals, so that the structural equations are representations of relations of facts about counterfactual dependence – as described above – whose truth conditions are broadly Lewisian.