I work as a product engineer at a company which has a matrix organization and the one constant is disagreements between departments. Whenever we have a major project we have meetings with the lead of each department to discuss the changes being implemented within the project. Everyone states their views and we settle any conflicts within that meeting. However, a month will go by and different department leads suddenly change their mind. They ignore the decisions made in the initial meeting and hold the project back due to their stance against a certain change. This has happened to me numerous times and at times it can be frustrating. To remove this type of silo, its best if people communicate face to face throughout the entirety of the project, not just once. Each department should respect their boundaries and not get involved in other department decisions. The only way this can be done is if everyone meets up and discusses the changes and write down a final agreement and then progress with the project.