Visualisation
A picture is worth a 1000 words.
Placing pictures a persons head is the best way to ensure they understand where they fit into the puzzle and how the can contribute to the flow of value creation at an optimum rate.
When a group of people don't have a shared vision of where they are going, despite best intentions they create turbulence which means wasted energy and no successful organisation can afford that.
Method
If you can't even draw it, how can you expect to build it?