Modeling 1 enrollment = N seats: when a table name lies

« Hold on, we need to talk, this doesn't add up » Friday morning, 9:15 AM. Françoise is in her cockpit — three screens: on the left the Excel attendance sheet she's kept up to date for fifteen years, on the right Sage, and in the middle Rembrandt for three weeks now. Cup in hand, the one with her face printed on it that someone gave her at Christmas. She swivels in her chair and calls over from her office: « Michel, combien on a d'inscrits pour la rentrée, dis-moi ? » — Michel, how many are enro