Welcome to "Identify and Select Relevant Information"
In the Cambridge Thinking Skills (9694) syllabus, particularly for Paper 1 (Problem Solving), you will often be faced with a lot of data. You might see a long story about a bus timetable, a complex table of prices, or a detailed graph. However, to solve the specific question asked, you usually only need a small fraction of that information.
Think of yourself as a filter. This chapter is all about learning how to separate the "signal" (the information you need) from the "noise" (the extra information designed to distract you). This is a foundational skill for the Understanding and Using Information section of your curriculum.
1. Understanding "Relevance"
Information is relevant if it directly helps you answer the question. Information is irrelevant if it is true, but not needed for your specific calculation or deduction.
Example: Imagine you are asked to calculate the cost of a train ticket for a \(12\)-year-old child on a Tuesday.
- Relevant information: Child ticket prices, Tuesday discounts, age limits for "child" tickets.
- Irrelevant information: The name of the train driver, the weight of the train, the price of coffee on the train, or the adult ticket price (unless the child price is a percentage of the adult price).
Key Tip: The "Question-First" Strategy
Don't worry if a large table of data looks intimidating at first! The best way to identify relevant information is to read the question before you read the data. When you know exactly what you are looking for, your brain naturally ignores the irrelevant "noise."
2. Dealing with Distractors
In Thinking Skills exams, examiners often include distractors. These are pieces of information that look like they should be used but aren't necessary for the final answer. They are there to test whether you truly understand the problem's requirements.
Common types of distractors:
1. Related but unnecessary data: Data about a different time period or a different person than the one mentioned in the question.
2. Information about a different "case": If the question asks for the "cheapest" option, data about the "fastest" option might be a distractor.
3. Contextual "fluff": Names, locations, and backstories that make the problem feel "real" but don't involve numbers or logic.
Quick Review:
Before you start a calculation, ask yourself: "Does this number actually change the outcome of the specific question I’m answering?" If the answer is no, set it aside!
3. Step-by-Step: Selecting the Right Data
When you are presented with a complex scenario, follow these steps to select the right information:
Step 1: Identify the Goal
What is the question actually asking? (e.g., "What is the total cost?", "Who arrived first?", "Which item is missing?")
Step 2: Identify Constraints
Look for words like "maximum," "minimum," "at least," or specific dates and names. These act as "filters." For example, if the question says "on a weekend," you can immediately ignore all data related to Monday through Friday.
Step 3: Locate the Data
Scan the text, table, or graph for the keywords you identified in Step 2. (Note: To learn more about reading different types of data, see the chapter on "Understand information in a variety of forms.")
Step 4: Filter and Extract
Write down only the specific numbers or facts needed. For example, if you need to calculate a \(10\%\) discount on a \(\$50\) item, you only need the numbers \(10\) and \(50\).
4. Identifying Cases that Satisfy Criteria
Sometimes, "selecting relevant information" means finding a specific item in a list that meets a set of rules. This is often called identifying cases that satisfy given criteria.
Analogy: It’s like using a shopping website and checking boxes for "Under \(\$20\)," "Blue," and "Free Shipping." Only the items that hit all those marks are relevant to your search.
Common Mistake to Avoid:
Students often find an item that meets one criterion and stop looking. Ensure you check the item against every rule mentioned in the text. If the scenario says a student must be "over \(16\) years old" AND "studying Science," a \(17\)-year-old History student is not a relevant case.
5. Summary and Key Takeaways
Selecting relevant information is the "sorting" phase of problem-solving. You cannot move on to calculations until you have correctly identified the pieces of the puzzle.
Key Takeaways:
- Read the question first: This turns you into a targeted seeker of information rather than a passive reader.
- Watch for constraints: Words like "only," "must," "after," and "except" are vital for selecting the right data.
- Ignore the "fluff": Don't feel like you have to use every number provided in the prompt. Some numbers are just there for decoration!
- Double-check criteria: Ensure the information you select meets all the conditions set by the problem.
Don't worry if this seems tricky at first! With practice, you will start to see the "hidden" logic in Paper 1 and become much faster at spotting exactly which numbers matter. In the next chapter, we will look at how to Organise the calculation(s) once you have selected your relevant information.