How does VIPABC do customer reminders?

With increasingly high marketing costs, organizations are increasingly valuing the renewal/renewal rate to tap the value of existing customers, so how do customers remind them to help them complete their courses and even stimulate consumption? VIPABC CEO Yang Zhengda talked about some of their practices in an interview with "China Distance Education". First, why do customers remind? "We set up the data Mining department at the beginning of the company, with professional math professionals and statisticians helping us with our operational research, one study found that as long as guests spend more than 16 hours on our online education platform for one months, his English progress will be very fast, About 30 classes will progress to a ladder, and then 30 or 40 lessons to advance a ladder, the average progress of two ladder above the people, the renewal rate will reach more than 85%. Therefore, new customers to join, we must urge him to class, must be more than 16 classes, and then the customer value increased, when the guests get learning results, English progress, he has the confidence to continue to learn, and then pay the renewal, introduce friends. "Second, how to do customer reminders?" "We have a special learning tracking system, if the guests within seven days of no class, the system will have a movement, according to the Address book to send notice, notice issued within 10 days after the class, there is an action, and so on ... The intensity of each action is not the same, from sending e-mail, texting, to the staff call, and then to the teacher to call himself. The guest attaches importance to the teacher when he calls over. Because for students, there is nothing more terrible than to receive a teacher's call. So our teachers not only provide teaching services, but also participate in customer service. These teachers are expatriates, the students are most afraid of the teacher called home. ”