International project management

Please mention tha answers with question numbers.

1.  Why is it so challenging to monitor and control international projects? 

2. 

In your opinion, what kind of competence is most important for an international project manager in order to successfully deliver an international project? And how could those competences be developed

Provide significant discussion information with APA citations for quotes or paraphrases and provide the research link that you have used to help you understand the question.