In particular, Freietag (1993, as cited by Kotler et al., 2014, p. 459) concluded that the
professionalism in sales, having contact data to potential clients and knowing their booking
history are essential to sales management. Additionally, caring and maintaining of a basic
client database, close cooperation with the marketing department as well as the recruiting
and training of sales persons were also defined as necessary to long-term success of sales
management