A theatre uses a computerized booking system to keep record of customers,plays and booking.a customer may make a booking in person by telephone or by pre-printed form. the booking clerk first has to check whether or the there are any seats free perfomance. if there are clerk reserves the seats then checks whether the customer's details are already on file, and if not, types them in.the ticket are then printed out and handed or sentto the customers. payment is made either in cash or by credit card