Yesterday I was listening to an episode of Arts and Ideas hosted by Matthew Sweet. The topic was pranks and the first request he made of his guests was for a typology of the terms prank, hoax, stunt, and practical joke. No one was prepared to give one but, through the course of the programme, they clearly preferred one term over the others in specific instances or tried to bypass the distinctions by claiming that what mattered was whether there was a laugh. This is no great surprise. Categories invariably have fuzzy boundaries although, famously, we like to think that we can know where something belongs " when we see it ." My thoughts turned to work, and the problem of stakeholders using sets of overlapping terms when discussing what they want with no time for conversations about the meanings ("don't give me all that semantics!"). So I thought, on 1st April, I would take the fool's errand of trying to imagine working on a project where those concepts were ...