The output should make the tradeoff visible enough for someone else to inspect, challenge, and act on.
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operations, process, quality & supply chain framework
Map logical causes of top event using gates.
quick answer
Fault Tree Analysis is a tree / hierarchy for Reliability analysis. It turns the decision into named fields, evidence, and a visible fault tree analysis worksheet / visual.
The output should make the tradeoff visible enough for someone else to inspect, challenge, and act on.
Map logical causes of top event using gates.
Use 5 Whys when its output is closer to the conversation you need: Ask successive why questions to trace root cause.
worked example
A filled example is easier to understand than a blank template. Use it to see the shape before applying the framework to your own case.
A filled example so you can see the shape before applying Fault Tree Analysis to your own context.
A filled example so you can see the shape before applying Fault Tree Analysis to your own context.
generate yours
Start Ask PL with the framework, required inputs, and your context. It will ask for missing details, render the tree / hierarchy, and explain what decision the output should change.
Apply Fault Tree Analysis to my situation. Context: [Decision, audience, options, evidence, and constraints.] Use the Fault Tree Analysis structure: - Root question: - mutually exclusive branches: - sub-issues: - hypotheses: Ask only for missing inputs that would change the output. Then render the tree / hierarchy and name the decision it should change.
how to use it
Use the framework to change a decision, not to fill a worksheet. Start narrow, add evidence, then inspect what the fault tree analysis worksheet / visual makes clearer.
Write the concrete reliability analysis choice, tradeoff, or conversation the framework should change.
Fill the important slots: Root question, mutually exclusive branches, sub-issues, hypotheses.
Mark what is measured, what comes from customers, and what is still judgment.
End with the next move, the riskiest assumption, or the evidence that would change the fault tree analysis worksheet / visual.
quality check
Use this check after the artifact is filled. Blank fields are not failure; they are the next research question. Look for concrete evidence, missing constraints, and assumptions that would change the next move.
The framework needs a concrete decision. Broad intent turns it into a worksheet, not a decision aid.
Good framework output makes assumptions visible enough for someone else to challenge.
The diagram is useful only if it changes the next product conversation.
common mistakes
Do not use Fault Tree Analysis as a worksheet. Name the choice, conversation, or tradeoff the output should change.
Separate measured facts, customer evidence, and leadership judgment so weak assumptions stay visible.
If the diagram does not match the decision, switch frameworks instead of stretching the boxes.
The framework should clarify the next move. It should not replace strategy, sequencing, or judgment.
use something else when
Ask successive why questions to trace root cause.
Benchmark and classify business processes across functions.
Model business workflows using standard process notation.
faq
Map logical causes of top event using gates.
Business context; objectives; available evidence; stakeholder judgment
Fault Tree Analysis worksheet / visual
Use Fault Tree Analysis when the decision matches this job: Map logical causes of top event using gates.
Avoid it when you need 5 Whys's output instead: Ask successive why questions to trace root cause.
It is both: a structure for thinking and a visible tree / hierarchy that makes the decision easier to inspect.
A good input names the real decision, uses concrete evidence, and separates facts from assumptions.
Use the fault tree analysis worksheet / visual to choose the next move, name the riskiest assumption, or decide what evidence would change the call.
Use 5 Whys when the real output you need is closer to: Ask successive why questions to trace root cause.
Yes. Describe your context and Ask PL can ask for missing inputs, render the tree / hierarchy, and explain what decision it should change.