8.2 If/Then And Must/May Logic
Key Takeaways
- If/then statements separate a condition from a result.
- "Must" means the conclusion is required; "may" means the conclusion is allowed or possible.
- Reversing an if/then rule is a common reasoning error.
- Official CJBAT facts should be carried forward exactly when used in logic practice.
Conditions Create Results
If/then logic is a compact way to organize a rule. The "if" part gives the condition. The "then" part gives the result that follows when the condition is met. Deductive Reasoning questions become more manageable when you translate policy-like wording into this structure.
For example, the official brief says late arrival or missing required materials means no test and no fee return. As an if/then statement, that becomes: if a candidate arrives late or misses required materials, then the candidate does not test and does not receive the fee back. The condition is late arrival or missing materials. The result is no test and no fee return.
Do not reverse the rule. If late arrival means no test, that does not prove everyone who did not test arrived late. Another reason may exist. A deduction must follow from the direction of the rule.
"Must" and "may" are also important. "Must" means required. "May" means allowed or possible. If the facts satisfy a rule, the result must follow. If a fact is merely compatible with a result, the result may be true, but it is not certain.
| Word or pattern | Meaning | Reasoning caution |
|---|---|---|
| If A, then B | A is enough to trigger B. | Do not assume B proves A. |
| Only if A | A is required for the result. | Look for the required condition. |
| Must | Required or necessary. | Use only when the rule forces it. |
| May | Allowed or possible. | Do not treat as certain. |
| Or | One condition may be enough. | Read whether the rule says either or both. |
Official testing rules provide clean practice material. The brief says acceptable excused absence requests must be made in writing within 14 business days after the missed exam and must include proof. A valid deduction is that a request without proof does not meet the stated requirement. It does not prove what every final decision will be unless the prompt states that rule.
Another official rule says the law-enforcement BAT exemption for candidates meeting the July 2022 service or education condition does not apply to candidates who want to enter a corrections academy. The condition matters. A candidate cannot move that law-enforcement exemption into the corrections track without contradicting the brief.
Use this logic checklist:
- Mark the condition after "if."
- Mark the required result after "then."
- Notice words like must, may, only, all, some, and or.
- Do not reverse the rule.
- Do not treat possible as required.
- Keep law enforcement and corrections conditions separate.
If/then practice is not about memorizing legal language. It is a disciplined way to read rules. The CJBAT uses multiple-choice questions, so the answer choices may include one conclusion that must follow and several that only sound plausible. Choose the necessary conclusion.
Rule: If a candidate arrives late, the candidate does not test and does not receive the fee back. Fact: A candidate arrives late. What must follow?
Why is reversing an if/then rule unsafe?
Which statement correctly handles the law-enforcement exemption described in the brief?