There are no specific criteria for measuring the quality of a TLD. Taking the data of the PuntuEUS Observatory as the basis, we have taken the following criteria into consideration when gauging the quality of TLDs.
Domain density: The contribution made by each domain to the Internet. To measure this, the average number of documents in the websites of each domain were measured. The result clearly shows that among the predominant TLDs in the Basque Country the .EUS domain is the one that makes the biggest content contribution towards the Internet. So it can be said that the .EUS websites post a lot of content thus making a big contribution towards the Internet. That is important in our case because a large proportion of that content is posted in Basque as far as the .EUS domain is concerned.