Questions to ask when choosing activites/books/other supplementary materials?

When I took my CELTA one thing we reviewed was things to consider when choosing supplementary materials. Here's the list of questions we came up with

• Can you adapt it to a different level?

  

  Things to keep in mind when choosing what to add

• Is it student or student friendly?
• Is it culturally sensitive?
• Can I legally photocopy it?
• What skill does it highlight?
• Does it add to the lesson?
• Is it in the budget?
• Is it useful in real life?
• What logistic do you need to arrange?
• How much time shall it take?
• Is it interesting?
• Will it challenge the students?

What questions  do you ask when choosing activities?