Some of my thoughts:

• Is it adequate for the task at hand? e.g. is its runtime fast enough for the job?, Does it have a garbage collector that might stop the process? once in a while? How easy it is to use parallel programming? Async? Threads?

• Is the hardware and OS we are using supported by the language and its ecosystem?

• How secure is the language? e.g. Does the language protect me from memory issues? How easy/difficult is to avoid crashes (uncaught exceptions, panics)?

• How is the tooling of the languages? IDE support? Linters? Debugger support? Packaging and installation of 3rd party libraries.

• Is there a central location for 3rd party open source libraries? How is the licensing of these libraries? What is the level of quality of the 3rd party libraries?

• How fast can people develop in the language?

• Are there already projects in the company written in this language? Do we have in-house expertise?

• Do team members already know the language?

• How long will it take to train them to be able to start implementing the system?

• Are there local trainers and consultants available to help with the language?

• Is there a local community around the language?

• Are there enough developers locally who already know the language? How easy will it be to recruit new employees?

What do you think?