WHERE WE ARE - Over Reliance on Regulator Safety Assessment : - Detailed Compliance Based Safety Assessment : WHAT WE WANT - Auditable Process Based - Use Performance Standards - Transparent Confirminity Assesment WHAT IT TAKES - Formal Methods Safety Assessment : - Decision Analysis Tools - Integrated Decision Making Use What we Know to Do What it Takes to Get What we Want What We Know Structured Performance Models Probabilistic Safety Assessments Systems Engineering Analysis