Snow employed a methodical approach that involved several key epidemiological techniques:
1. Mapping Cases: He created a dot map to plot the locations of cholera cases in the affected area. This visual representation helped him identify a pattern.
2. Hypothesis Formation: Snow hypothesized that cholera was waterborne, contrary to the miasma theory.
3. Data Collection: He conducted interviews with local residents to gather information about their water sources.
4. Statistical Analysis: Snow compared cholera incidence among households using different water sources, noting a significant correlation between the disease and water from the Broad Street pump.
