BarrierNotes Academy — evidence-request worksheet
Keep functional-safety handover questions open
Learning reference: BN-AW-FS-01 · version 1.0.0

Fictional awareness practice. This record does not certify competence or approve equipment, a safety function or operation.
Use fictional facts and role names. Keep confidential records in your responsible project process.

Fictional dossier: vessel V-7
Hazard note H-3 revision 1: Unwanted heating may lead to a temperature rise, loss of containment and exposure. Stored heat or an ongoing reaction may continue after the heater is isolated.
Draft function DF-2: 'On a high-high vessel-temperature condition, isolate the heating supply.' The trigger threshold and required safe outcome are not yet justified.
Requirements draft R-0: Says 'SIL 2, response within 2 seconds — same as the previous vessel'. No risk-allocation or process-response evidence is attached.
Bench note B-6: Records that a controller output relay changed state during a bench stimulus. It does not describe installed sensor/final-element response, the vessel's process response or comparison with approved requirements.
Draft handover: 'Controller tested. Shutdown is safe. Start-up ready.'

1. Received record and configuration
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2. Narrow claim supported
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3. Unresolved requirement or outcome evidence
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4. Evidence provider and responsible review
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5. Review trigger and handover status
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Written practice
Activity 1: write a bounded candidate statement
Rewrite the draft handover in two sentences: accurately state the proposed trigger/action, then state why the dossier does not establish a safe outcome or start-up readiness. Do not choose a threshold or another protective action.
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Activity 2: prepare three evidence requests
Write one request about the process outcome, one about the copied response time/SIL, and one about the bench note's scope. Give each request a responsible review route. Use role names only.
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Activity 3: preserve the change trail
New fictional information: after the bench check, the designer replaces the output relay with a different final-element arrangement. Write the updated handover and the next question. You have no test evidence for the new arrangement.
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Review your own work against the public examples. No answer has been graded or saved by BarrierNotes.

Public sources checked 2026-10-04
S1 — HSE: functional safety: https://www.hse.gov.uk/eci/functional.htm
S2 — HSE: what is competence?: https://www.hse.gov.uk/competence/what-is-competence.htm

Free awareness practice. This lesson does not certify competence, assign SIL, approve a safety requirements specification or authorise plant operation. It is a separate public exercise, not the full FS-101 course.