10 Questions
What are the two kinds of nodes in risk trees?
Failure nodes and Logical nodes
How are failure nodes represented in risk trees?
Failure nodes are represented by circles or rectangles depending on whether they are basic or decomposed further into causes
Explain the difference between AND and OR nodes in risk trees.
In the case of an AND node, the causing child nodes must all occur for the parent node to possibly occur as a consequence. In the case of an OR node, only one of the causing child nodes needs to occur for the parent node to possibly occur as a consequence.
How can risk checklists and guidewords be used to identify failure nodes in risk trees?
Risk checklists and guidewords can be used to capture patterns of failure through specific words and to identify failure nodes in a risk tree.
What is the most general case of risk trees in terms of their structure?
In the most general case, risk trees are directed acyclic graphs where one child failure node may be causally linked to multiple parent failure nodes.
Explain the concept of cut set in risk trees and how it is obtained.
The cut set of a risk tree is the set of all minimal AND combinations of least events or conditions, each of which is sufficient for causing the root failure node. It is obtained by taking all leaf nodes of another tree, called the cut set tree, derived top down from the risk tree.
How are failure nodes identified in risk trees using risk checklists and guidewords?
Failure nodes in risk trees are identified using risk checklists and guidewords, which capture patterns of failure through specific words such as 'NO', 'MORE', 'LESS', 'BEFORE', and 'AFTER'. These patterns help in identifying the failure nodes.
What is the relationship between child failure nodes and parent failure nodes in directed acyclic graphs of risk trees?
In directed acyclic graphs of risk trees, one child failure node may be causally linked to multiple parent failure nodes.
Define the cut-set tree and its relationship with the risk tree.
The cut-set tree is another tree derived top down from the risk tree, where the top node of the cut-set tree is the top logical node of the risk tree. It contains all the leaf nodes used to obtain the cut set of the risk tree.
What are some examples of specific words used as guidewords to capture failure patterns in risk trees?
Examples of specific words used as guidewords to capture failure patterns in risk trees include 'NO', 'MORE', 'LESS', 'BEFORE', and 'AFTER'.
Test your knowledge of risk trees with this quiz! Learn about failure nodes and logical nodes, and understand how they capture independent failure events and causal links. Sharpen your understanding of risk analysis and decision-making processes.
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