Correct, in real life queued objects (or people) are "agents" that exhibit imperfect behavior that doesn't really adhere to a perfect queuing equation. Classic

Correct, in real life queued objects (or people) are "agents" that exhibit imperfect behavior that doesn't really adhere to a perfect queuing equation. Classic example is motor vehicle throughput: queuing equations might be helpful in broad strokes for coarse estimates but need agent level simulation to accurately predict outcome.