Usability
Interface 
User-friendliness/complexity of the tool´s interface
Intuitive.
Time efficiency Time needed for mastering the „how-to“ of the tool and a production of a task
Low; it takes time to create a character and configure an educational setting.
Interface language(s) The number of languages in which the tool is currently available/adaptable to
English + 8 other languages
Respect for privacy Does the tool require registration? Who can see my data? Can I remain anonymous?
Medium. Linden Lab, Second Life’s developer, collects various types of personal information such as first and last name, postal address, e-mail address, telephone number, username, and/or image (optional) when creating an account. The platform uses chats and forums that are accessible by other users or the public, so it is important to consider this when sharing information. It also collects cookies for different purposes, among which is marketing. Its privacy policy mentions the implementation of technical, physical, and organisational security safeguards to protect personal information. Second Life acknowledges users’ rights to correct, delete, or limit the use of certain data, together with withdrawing consent from marketing communications. Second Life has another, more stringent privacy policy for young adults, that is teenagers over 16 years old. Linden Lab complies with the GDPR. See more here.
Saving work for future use Possiblity to save your or others´ work for reuse/reproduction
Yes.
Tailorability (If so, how?) Possibility of the tool to be used for a range of different activities (e.g. to what extent you can organize a project assignment with a central activity based on this tool)
Medium; Second Life can be adapted as a language learning tool with the right educational setting, and used with different pupils at different levels.