I would say for someone who doesn't know a slavic language but is interested in what they are like, it's a very good introduction to general vocabulary and grammar that's not overwhelming and gives a good feel for the languages as a whole.
@KABAN Interslavic is like a language bridge for Slavic people. It helps them talk to each other even if they speak different Slavic languages. Some think it's a cool idea that brings Slavic nations closer, while others worry it might affect their own languages. Your school project could explore both sides of the discussion to get a clear picture.
Interslavic is like a language bridge for Slavic people. It helps them talk to each other even if they speak different Slavic
That's the theory but does it actually work in practise? ie someone who knows interslavic talking to someone else from another slavic country who is not aware of it.