Usability
Interface 
User-friendliness/complexity of the tool´s interface
Easy to navigate, intuitive.
Time efficiency Time needed for mastering the „how-to“ of the tool and a production of a task
Medium.
Interface language(s) The number of languages in which the tool is currently available/adaptable to
English.
Respect for privacy Does the tool require registration? Who can see my data? Can I remain anonymous?
Medium. TED collects various types of personal information and cookies for multiple purposes, such as providing services, personalisation, or communication. It may share user data with third parties for various purposes, including behavioural analysis to tailor TED’s advertising to users' interests on other websites. However, users can opt out of this. TED implements updates and safeguards to ensure the secure processing, management, and storage of user data. It also acknowledges users’ rights to update, change, or delete their personal data. TED complies with the GDPR. See more here.
Saving work for future use Possiblity to save your or others´ work for reuse/reproduction
Yes, teachers can save lessons into their TED profiles.
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)