I also agree with Adrian. I have worked with establishments where different companies have come together to work on a project and some of these companies have actually merged. Believe it or not basic communication becomes a problem. This lack of communication may create distrust and uncertainty in a workplace. This often leads to lower employee engagement levels. When managing key projects it is very important to keep both parties informed at all times. Both parties may have their own organizational structures but it all boils down to how seamlessly they work together.