Which days each doctor is already busy. For the chosen weekday, every doctor × clinic shows that weekday for the last four weeks and the 4-week average. Green = gross utilisation at or above the threshold → ask for advance payment on that day. Gross = booked (done + no-show) hours ÷ available hours · No-show % of gross = no-show hours ÷ booked hours · Net = done hours ÷ available hours.