Optimising Against Several Criteria

Lab Brief #4

🎯 Your mission

Learn the rule. Then catch nature using it.

⚡ The twist

The first design always fails. That's the point.

What you'll learn

Real designs are judged on several criteria at once, and the best compromise depends on which matter most. Scoring each option against weighted criteria makes the reasoning visible instead of leaving it to instinct.

Key words

weighting
How much importance each criterion is given when scoring options.
decision matrix
A grid scoring each option against each weighted criterion.

Make a hypothesis first

Guess: what's the weakest part of this build?

Say your guess out loud — then find out if you were right.

Step 1 of 4 · Read

Think about what you just learned: say what "weighting" and "decision matrix" mean in your own words before you start.

Step 2 of 4 · Do

Build a decision matrix for three school-bag designs against cost, weight, durability and capacity. Score, weight and total them, then change the weightings and see whether the winner changes.

Step 3 of 4 · Observe

Record what actually happened, including anything that did not match what you expected.

Step 4 of 4 · Record

Write a conclusion that answers the question this lesson opened with, and state your uncertainty.

Question 1 of 2

A decision matrix makes design reasoning:

How sure are you?😐 maybe

Question 2 of 2

Changing the weightings can change:

How sure are you?😐 maybe

Mind = blown

🚀 The Saturn V rocket burned 20 tons of fuel per second at liftoff.

Nice work!

You got 0 of 2 right.

Next: Safety Factors in Engineering All lessons

🎯

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✨ More to explore

🌍 Where you see this in real life: Every bridge, building, and gadget you've ever used started with this.

🏆 Stretch challenge (try it this week): Find something that's broken at home and try to figure out *why* it broke.

👨‍👩‍👧 For the dinner table: “What's something around the house you'd redesign — and how?”

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