How to ensure accuracy in your database Data which is procured externally should be verified, before integrating it with the master database. In order to maintain the quality of your database a robust data verification process should be in place. Span Global Services has a data verification process in place, which can ensure high data quality, accuracy and adherence to authentic prospects. The two methods of data verification we follow include automatic data verification and manual data verification. here In the automatic data verification method, emails are sent to all the email addresses on the list. Recipients who are not interested in receiving mails are given a choice to opt out. All opted out email addresses are removed from the list and sent for manual verification. In the manual data verification method, tele-callers connect with contacts on the list to get consent for promotional calls. People who are not interested in receiving calls are placed in a "do not call" list.