Most writing about algorithmic decision making is at a very high level, and often implies that a very wide range of decisions and processes will be affected in very similar ways. This article – originally a submission to a select committee inquiry on the subject – take a more granular approach, looking at how different approaches might be appropriate for different aspects of a hypothetical National Benefits Service, with an emphasis on ensuring that it is always clear how a decision has been reached, as well as what that decision is.