Answer:
Collaboration.
Step-by-step explanation:
Collaboration is the process by which two or more people or group's come together to achieve a particular goal. It usually needs leadership to guide it's activities, and is similar to cooperation.
The departments are complaining and saying the other one has it easy. Bother departments are functioning independently.of one another and so cannot understand the unique challenges faced by the other team.
When they collaborate they pool their resources together to achieve more. They also get to understand the pain points of the other department and this helps foster a good work environment.