Customer group that surveys must be current customers and keep in touch with the company not less than 1 year, and to make customer satisfaction survey. At least once a year.
Customers need a current customer survey. And contact the company at least one year and will make a customer satisfaction survey at least 1 time per year.
Customers who explore customers need to be present. Contact with the company, and not less than 1 years. And a survey of customer satisfaction, each year 1 times at least.