Why is collecting internal and external data crucial during documentation of rationale?

Collecting internal and external data during the documentation of rationale is essential because it enhances the accuracy and reliability of the estimates being made. In risk analysis, estimates are often based on data that reflect both the organization's historical experiences (internal data) and the broader context or industry benchmarks (external data).

By integrating both sources of information, analysts can create a more comprehensive and validated view of the situation. This approach helps to mitigate biases and errors that might arise from reliance on a single source of information. It ensures that the conclusions drawn are well-supported, systematic, and reflect a balanced perspective, which is critical for making informed decisions in risk management.

While other options may refer to different aspects of the analysis process, they do not capture the primary role that data plays in verifying and strengthening the foundation of risk estimates, which is fundamentally about ensuring their accuracy and reliability.