Language again, and again English. However, here we need to look at the
situation from a little bit different side. What I’m talking about is that while working internationally there is a huge possibility your peers are going to be from different countries which means English might be a foreign language for them, which definitely means something.
Firstly, the communication level may vary. Those, for who English is a native language; or it is a second language for them; or maybe they are practicing it often; or they have mastered it perfectly, they could speak English better than you are. And vice versa, for some of your peers English could be really challenging. That is why you are as a project manager need to find the best communication channels that would fit the whole team; and will facilitate your communication; and you will be able to collaborate altogether.