Apply guarded transitions
See this course’s project requirements
A tested fictional equipment-repair workflow with a transition table, guarded actions, rejected transitions and a trace of two complete cases.
Keep your working files in your own notebook or software. Save a private description, checklist, and work link in My Proof.
What to include
- A workflow map with distinct states and events.
- A complete allowed-transition table and a rejection case.
- A guarded verification matrix with accepted and rejected cases.
- An impossible-event test with state preservation.
- Complete, resumed and rejected workflow traces.
- A tested finite workflow model with honest completion boundaries.
Review and revise
Use these criteria to check your work and choose what to improve.
- The implementation or declared simulation follows the supplied contract and retains inspectable original inputs.
- Normal, boundary and rejected cases are recorded with expected versus observed results.
- The changed case has a correct explanation and does not rely on hidden state.
- The project includes source, outputs, instructions and honest tool, privacy and verification limits.
Want more background?
The idea in everyday life
In repair, verify with checks_passed=False is rejected. With True it is accepted and returns tested.
A guard adds a requirement beyond an allowed state/event pair. The verify event requires checks_passed=True; being in repair alone does not establish that the work was verified.
Apply guarded transitions — original worked practice
A guard adds a requirement beyond an allowed state/event pair. The verify event requires checks_passed=True; being in repair alone does not establish that the work was verified.
In repair, verify with checks_passed=False is rejected. With True it is accepted and returns tested.
1. Step 1
Locate the verify guard after pair validation.
You should see: verify requires passed checks.
This keeps the rule and its observable result together.
2. Step 2
Try the False case and capture ValueError.
You should see: There is no next state from that failed call.
This keeps the rule and its observable result together.
3. Step 3
Try True from the same repair state.
You should see: The next state is tested.
This keeps the rule and its observable result together.
4. Step 4
Record the pair eligibility and guard separately.
You should see: A guarded verification matrix with accepted and rejected cases.
This keeps the rule and its observable result together.
What to finish
A guarded verification matrix with accepted and rejected cases.
Watch for this
Advancing from repair to tested before the verification guard is true.
How can I tell I understand it?
Explain and demonstrate the required distinction: A guard adds a requirement beyond an allowed state/event pair. The verify event requires checks_passed=True; being in repair alone does not establish that the work was verified. Show a changed input and the expected result without weakening this contract.
Quick knowledge check
Answer all 3 questions. Get at least 2 right and the lesson completes automatically.
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Sources and further reading
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Source & access notes · checked 2026-10-01
Relevant documented module/API behavior inspected during expansion authoring; actual execution evidence is recorded separately. No grant eligibility is established.
Access: Official page retrieved with the web reader on 2026-10-01. Documentation reading does not certify execution in every native tool or browser.
Reuse: Original local practice files, fictional data, worked examples and questions. Concepts paraphrased and linked; source exercises are not copied.
Source & access notes · checked 2026-10-01
Relevant documented module/API behavior inspected during expansion authoring; actual execution evidence is recorded separately. No grant eligibility is established.
Access: Official page retrieved with the web reader on 2026-10-01. Documentation reading does not certify execution in every native tool or browser.
Reuse: Original local practice files, fictional data, worked examples and questions. Concepts paraphrased and linked; source exercises are not copied.
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