Bowtie analysis might be an helpfull tool for risk assessment. I used yEd to create my own bowtie (see the source at the end).
Bow tie analysis in the ISO 31010.
Bow tie analysis is a simple diagrammatic way of describing and analysing the pathways of a risk from causes to consequences. Bow tie analysis is used to display a risk showing a range of possible causes and consequences.
Tiger in the cage examples
Additional material
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video Bow Tie Analysis
Source for bowtie in cage for yEd tool
It is possible to create bowtie diagram in yEd tool.
To get started, the source for the example below is here (unzip first).