The document outlines the 10 steps for investigating an outbreak of disease: 1) establish existence of outbreak, 2) confirm diagnoses, 3) define cases, 4) relate cases to time, place and person, 5) identify those at risk, 6) form hypothesis, 7) test hypothesis, 8) plan detailed investigation, 9) prepare written report, and 10) implement controls. It also provides an example structure for the outbreak investigation report.