Assessment at Masters Level is the subject of a three-year UK National Teaching Fellowship Scheme (NTFS) project, "Assimilate", which seeks to explore innovatory approaches in this field. More than 40 interviews were undertaken for the project with teachers at Masters level in the UK and internationally. Although national and institutional systems differentiate clearly in their documentation how assessment at M-level should differ from that at undergraduate level, in practice there is not necessarily such clarity. This article draws on how teachers and programme leaders on Masters level courses who were interviewed for the project described the differences in practice. It concludes that there is considerable confusion and ambivalence about what distinguishes one level from another and scope for further clarification.