Abstract
Abstract To the editor's four questions we answer as follows: 1. 1. The philosophical basis is probability as a measure of degree of confidence and probability curve as expression of state of confidence, state of knowledge, or state of certainty. 2. 2. The strength of this approach is simplicity, conceptual coherence, ability to handle any situation involving partially complete, partially relevant, and different kinds of evidence, and simple computational procedures for combining uncertainties. 3. 3. This approach has real impact on the feasibility, interpretability, and usefulness of PSA for decision purposes. 4. 4. Lack of understanding of this approach has led to misuse and, especially, to non-use of PSA; this has led to wrong decisions contributing to disasters such as Chernobyl, Challenger, Piper Alpha, Henderson, etc.
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