safety risk assessment panel members will sometimes want to assess risk based on the worst outcome of the hazardous condition and not necessarily on the worst credible outcome. People tend to believe that all hazardous conditions could lead to a catastrophic event. Although the worst can happen, it may not represent what is reasonable or credible. The facilitator needs to challenge this specifically asking for data to support the panel's assertion. Questions the facilitator should ask include, "Is that truly what you expect to happen?" or When was the last time that occurred? These are simple ways to challenge the panel without stifling discussion and interaction.