Green—Worldwide Watch (corresponding to WHO phases 1–2)
Yellow— Efficient Human-to-Human Transmission (WHO phases 3–5)
Orange—Human Transmission within the Great Lakes area (WHO phase 5)
Red—Full-blown Worldwide Pandemic (WHO phase 6)
Blue—Recovery (WHO post period)
The University of Michigan Pandemic Influenza Response Plan Summary Matrix can be accessed in PDF format. The plans themselves are maintained by specific units, and contain sensitive information that goes into considerable detail on actual response actions.