I quite agree with the point made about communication being a big challenge that PM’s have to face. If the team you are working with is one that is global, the language barrier becomes a huge obstacle to overcome. Sometimes the way the PM may communicate a point or the importance of something may not come across completely to those on the other end of the barrier. I’ve had experience with this where a great deal of my team was overseas. The manager we had was becoming frustrated that the overseas division was not carrying out things that he had constantly repeated to them as important to the same degree of priority he had communicated. After some conversation with them, it was found that the way he had told them the priority of the activities had actually confused them, causing them not to do what he had wanted. Since many things were “important” they had taken something critical to be as “important” as everything else.
It’s very hard to understand how others in other cultures will understand what you say, but I would say taking small steps and asking for confirmation in comprehension are small things a PM could do to mitigate this.