Increased in complexity
Each branch is important in the entire chain to get from a design to a functional product. In the domestic time, these different branches are also situated within different companies, which makes cooperation very important.
The knowledge about the item within the various branches has increased because the techniques have become more complex.
That means to be effective in the chain, the chain must be closed. An incomplete link can seriously damage the outcome. Understanding each other and working together on that basis is therefore a requirement.