Constructing a web of causation involves several steps: 1. Identify the Outcome: Define the health outcome or disease in question. 2. List Potential Factors: Identify all possible factors that might contribute to the outcome. This includes direct causes and indirect influences. 3. Map Relationships: Illustrate how these factors are interrelated. Use arrows to indicate the direction of influence and create a network that shows the complexity of interactions. 4. Analyze the Web: Evaluate the strength and significance of each connection to understand which factors have the most substantial impact.