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Particularly in this part of the world as you will find numbers of different nationalities in one team.
I totally agree. The human resource part is the most difficult part. And I can add even if they are from the same nationality or even from the same gender. Human actions are normally hard to predict.
The key is to know each individual or group driving motives to be able to lead them properly. If he/she/they can find a reasonable reward from the project they will not perform in an efficient way.
I strongly support the HR functions of the hardest tasks because it is the basis of the success of any organization depends entirely on the administration to adopt in this section ..