The different stations don't represent developers, they represent discrete tasks. So that could be designer > coder > qa, or dev stack 1 > dev stack 2 > dev st

The different stations don't represent developers, they represent discrete tasks. So that could be designer > coder > qa, or dev stack 1 > dev stack 2 > dev stack 3. A coder waiting for a design won't just go and design. A developer with Stack 3 might be familiar with Stack 2 but might not know the best practices from that stack, introducing bugs or funky code that will create more work later on. If all your developers can do all the tasks, the graphics in this story don't apply.