According to CRN analytical group, 2021 ranking included two rounds. In the first round, a special group of candidates was selected. This group chiefly included companies from the ranking lists released in previous years and also second-tier partners named by vendors and distributors. In the second round, the experts evaluated operations and performance results of the selected companies and ranked them by the following criteria: Business Scale, Business Dynamics, Team Expertise, Goodwill and Resilience in Crisis.