Analyze system failures in a model

Supplied materials

• All measurements and observations below are supplied classroom examples. They are not data from actual learners or a claim about a particular real site.
• Paper or a browser document for a labeled drawing, table or explanation.
• Worked problem inputs: A controller issues a corrective command but the actuator stays still. Locate the demonstrated failure.
• Assessment case 1: The modeled sensor sends no reading; the controller and effector are otherwise functional. Which limit follows? Which inference or prediction is best supported?
• Assessment case 2: Which scientific label fits the specifically described step or feature? Supplied case: Controller ignores a received signal.
• Assessment case 3: Which scientific label fits the specifically described step or feature? Supplied case: Command sent but model actuator stays still.
• Assessment case 4: Which scientific label fits the specifically described step or feature? Supplied case: Only final outcome is recorded.
• Assessment case 5: Which scientific label fits the specifically described step or feature? Supplied case: Model stimulus is not detected.
• Assessment case 6: The sensor reports a change, but the controller sends no output. What follows? Which inference or prediction is best supported?

Learn the idea

A pathway failure can arise at detection, processing, action or missing evidence. Identify what the record explicitly shows rather than inventing a medical cause. Use fictional signals only.

Detection gap means no stimulus signal reaches controller. Control gap means signal arrives but rule is not applied. Action gap means command occurs but effector does not act. Evidence gap means needed pathway record is missing.

For the supplied mechanism problem, A controller issues a corrective command but the actuator stays still. Locate the demonstrated failure. The supplied evidence identifies an action or effector gap. It does not prove the sensor is broken, because detection and control have already produced a command.

1. Read the supplied problem and mark the structures, processes or quantities named: A controller issues a corrective command but the actuator stays still. Locate the demonstrated failure.
2. Draw the relevant boundary, pathway or comparison and label it using the scientific ideas above.
3. Write a causal explanation or calculation, showing how each observation supports the result.
4. Compare your reasoning with the worked solution; name a condition that would change or limit the inference.

Check your reasoning

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Take it further

New fault record: an actuator moves correctly when commanded, but no command occurs despite a received sensor signal. Expected: the demonstrated gap is control processing, not actuator movement; the evidence does not diagnose a real organism.

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