Introduction: Building a Strong Case

Imagine you are trying to persuade a friend to watch a new movie. You don’t just give one reason; you might talk about the famous actors, the exciting plot, and the great reviews it received. Each of these "lines of thought" is what we call a strand of reasoning.

In Thinking Skills, developing strands of reasoning is the "muscle" of your argument. It’s not just about what you believe, but how you build a sturdy path of logic to get there. This skill is especially important for Paper 2, Question 5, where you have to write your own short argument from scratch.

What is a "Strand" of Reasoning?

A strand of reasoning is a sequence of one or more reasons that lead toward a conclusion. Think of it like a physical strand of a rope:
1. One strand provides some support.
2. Multiple strands twisted together make the argument much stronger and harder to "break."

If you have two different reasons for a conclusion that don't depend on each other, you have two separate strands. For example:
Strand 1: It is raining, so we should stay inside.
Strand 2: We have a lot of homework to do, so we should stay inside.
Even if the rain stops (Strand 1 fails), the argument for staying inside still stands because of Strand 2.

How to Develop Your Strands

To get top marks, you need to show the examiner that you can move logically from a basic point to a more complex one. Here is a step-by-step guide to developing a strand:

1. Start with a Point (Reason)

Identify a factual claim or a principle that supports your side.
Example: "Using plastic bags harms marine life."

2. Build the "Bridge" (The Development)

Don't just jump to the end! Explain how or why that reason leads to your conclusion.
Example: "...because animals often mistake plastic for food, which can lead to starvation or poisoning."

3. Use Intermediate Conclusions (The Milestone)

A strong strand often leads to an Intermediate Conclusion (IC) before reaching the Main Conclusion (MC).
Example: (Reason) Plastic harms marine life \(\rightarrow\) (IC) Therefore, we must reduce our plastic consumption \(\rightarrow\) (MC) Therefore, the government should ban single-use plastic bags.

Note: For more on how to use Intermediate Conclusions, see the chapter on "Structure reasoning using intermediate conclusions."

Independent vs. Joint Strands

When you are constructing your argument, it is helpful to think about how your reasons relate to each other.

Independent Strands: These are separate paths to the same conclusion.
\(Strand A \rightarrow Conclusion\)
\(Strand B \rightarrow Conclusion\)
Analogy: Two different witnesses seeing the same crime from different angles.

Joint Reasons within a Strand: Sometimes, two reasons must work together to make sense.
\((Reason 1 + Reason 2) \rightarrow Conclusion\)
Example: (1) I have a ticket + (2) The bus is here \(\rightarrow\) I can go home. One without the other doesn't work!

Quick Tip: The "Why Should I Care?" Test

If you write a reason and it feels a bit "thin," ask yourself: "What is the consequence of this?" The answer to that question usually helps you develop the strand further.

Common Mistakes to Avoid

Don't worry if this feels tricky at first! Many students make these common errors when starting out:

1. The "List" Trap: Writing a list of unrelated facts rather than connecting them. An argument is a chain, not a grocery list.
2. Logical Leaps: Moving from a small reason to a massive conclusion without explaining the steps. For example: "The school lunch was cold today, so the headteacher should resign." (This needs a few more "strands" or "bridges" to make sense!)
3. Repetition: Saying the same thing three times in different ways isn't "developing strands"—it's just repeating one strand.

Summary Checklist for Students

When you are writing your argument in the exam, ask yourself:

  • Have I provided more than one "line of thought" (strand) to support my conclusion?
  • Do my reasons flow logically into one another?
  • If one of my reasons was proven wrong, would my conclusion still have other support?
  • Have I used words like "therefore," "consequently," or "it follows that" to show how my strands are developing?

Key Takeaway

Developing strands of reasoning is about quality and quantity. By providing multiple, well-explained paths to your conclusion, you make your argument persuasive and robust. Remember: A single thread is easy to snap, but a multi-stranded rope can hold a lot of weight!