Marketing won't speak to engineering.
Sales thinks production hogs the budget.
Front desk believes back room's lazy.
If this sounds anything like what you deal with on your team then you need to read Patrick Lencioni's latest book entitled Silos, Politics, and Turf Wars (buy the book at amazon)
Lencioni presents a model for achieving alignment across departments within an organization and thus, eliminating unnecessary and costly infighting.
Whereas Lencioni's book The Five Dysfunctions of a Team is a fantastic tool to be read and used by the entire team/organization, Silos, Politics, and Turf Wars is designed more for the leadership team within the organization.
Silos helps you understand the critical leadership lesson of: "If everything is important, then nothing is." Lencioni has a nice article about this lesson in his latest newsletter (read it here).