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Figure 4.2. Fault tree showing the effect of less reliable mistake-proofing device

Fault tree of benign failure showing the effect of less reliable mistake-proofing device (Probability calculations are omitted from this description). Top element 'Benign failure' splits at OR symbol into two branches, each leading to an AND symbol. First (left) branch splits into two elements: 'Cause #4'; and 'MP device fails.' Second (right) branch splits into three elements: 'Cause #4'; 'Cause #3'; and 'Cause #2'.

Figure 4.3. Fault tree showing reliability of a mistake-proofing device

Figure 4.3. Fault tree of a harmful event showing reliability of a mistake-proofing device (Probability calculations are omitted from this description). This fault tree progresses from top element 'Harmful Event' to; OR symbol, which splits in three branches. First branch (left) leads to AND symbol where tree again splits in two, leading to pair of elements labeled Cause #1 and Cause #2. Second branch (center) leads to element labeled Cause #3. Third branch (left) splits into two elements: 'Cause #4'; and 'MP device fails.'

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