• Prepare for field work.
  • Establish the existence of an outbreak.
  • Verify the diagnosis.
  • Construct a working case definition.
  • Find cases systematically and record information.
  • Perform descriptive epidemiology.
  • Develop hypotheses.
  • Evaluate hypotheses epidemiologically.
  • As necessary, reconsider, refine, and re-evaluate hypotheses
  • Compare and reconcile with laboratory and/or environmental studies
  • Implement control and prevention measures
  • Initiate or maintain surveillance
  • Communicate findings