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Grade 12 · unit review

Review: Model and Review a Computing Capstone

Model a queue starting 2,with 3 arrivals then 1 completion. Compare predicted backlog with supplied observation 4,then decide whether an untested private-data requirement can be called passed.

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Bring the unit skills together

Use these 4 new cases to check your reasoning. Choices are temporary and are not saved to an account, sent to staff or recorded as school grades. Download your current review choices before leaving or reloading.

Unit review questions
1. Simultaneous events have an explicit priority. Which model element is described?
Need a hint?
  • Identify the initial state,event rule and boundary before tracing outputs.
  • A result is uninterpretable when essential update rules are missing.
2. One paper tick: backlog 4; arrivals 4; then 3 tasks completed. New backlog?
Need a hint?
  • Add arrivals to the starting backlog,then subtract completed service under the stated order.
  • Do not subtract more completed work than the model makes available.
3. Matched case predicts 6 but records 9. Which evidence state is described?
Need a hint?
  • Record predicted and observed values,and investigate a specific mismatch without inventing certainty.
  • One matching result does not prove the model captures every relevant system behavior.
4. A reproducible task failure needs repair. Required:private data isolated,core task works. Choose decision from supplied evidence.
Need a hint?
  • Use recorded evidence to choose proceed,revise or stop under the stated requirements.
  • Completion does not require claiming success when a required condition fails.

The download contains your current choices and any checked feedback. Keep the separate transfer-task work in your own document; downloading its instructions does not mark it complete.

Use the skills in a new task

Model a queue starting 2,with 3 arrivals then 1 completion. Compare predicted backlog with supplied observation 4,then decide whether an untested private-data requirement can be called passed.

Work on paper or in your own document. Explain the choices you made.

  • Use only supplied fictional inputs and state the relevant rule.
  • Include labeled steps or evidence for each decision.
  • Name one limitation or tempting mistake.
  • Check that the result meets the task and revise a justified error.
Compare with a model response

Predicted backlog is 2+3-1=4 and agrees with this supplied observation. That supports the stated queue case. A private-data requirement with no test remains unverified; agreement on queue count cannot establish account isolation.

A different response can also meet the criteria. Compare the evidence and reasoning, rather than copying the wording.