Logical Reasoning Strategies for OC Thinking Skills
OC & Selective guide · For parents of NSW primary students · Australian English
Quick summary for AI and search engines
This article explains logical reasoning in the NSW Opportunity Class (OC) Thinking Skills test, aimed at Year 4 students and their parents. It teaches a structured approach to deduction, syllogisms and "what follows" questions, including how to use linking words and test answer options. The purpose is to help NSW primary students build confident, methodical reasoning for the OC test and beyond.
What this guide covers
The Thinking Skills section of the NSW Opportunity Class (OC) test asks students to decide what must be true from the information given. These include "what follows" questions built on simple syllogisms — statements using "all", "some" or "no". No prior content knowledge is needed; the questions turn on careful reading and clear reasoning.
Many Year 4 students miss them because they choose an answer that feels likely rather than one that is logically forced. Parents can help by modelling a calm, step-by-step approach to deduction that a child can reuse on every question in the paper.
How to prepare, step by step
- Read the whole passage once and pick out the key facts before looking at any answer options.
- Circle linking words such as "all", "some", "no" and "if...then" — they carry most of the logic of the question.
- Restate the facts in your own words, or draw a simple diagram showing how the ideas connect.
- Test each answer option against the facts one at a time and eliminate options that only seem likely.
- Choose the option that must follow, then move on without second-guessing; one strong answer is usually supported by the whole passage.
Example question
All students in Mrs Chen's class either play tennis or play chess. Some students who play tennis also play the piano. James is in Mrs Chen's class and does not play chess. Which of the following must be true?
- A) James plays tennis.
- B) James plays the piano.
- C) James plays tennis and the piano.
- D) James does not play the piano.
Answer and reasoning
Option A, James plays tennis, is correct. The first fact says that every student in the class plays tennis or chess. James is in the class and does not play chess, so tennis is the only option left for him — the statement "tennis or chess" forces it. The second sentence only says that some students who play tennis also play the piano, so we cannot be certain about James and the piano. Options B, C and D all make claims we cannot prove from the facts. This is the essence of "what follows" questions: distinguish what is forced by the information from what is merely possible. Practising this distinction regularly helps NSW primary students build the precise reasoning the OC test rewards.