Use results to explain which design works better.

SECTION 1

Why Do We Test Things?

People have always tried new ideas. They test things to see what works!

Long ago, people tried different ways to build. They looked at what happened and picked the best way.

Long Ago

Building Homes

People tried sticks, mud, and stones. They picked what stayed up best!

Later

Making Boats

People tested wood and leaves to see what floated. They used what worked!

Today

Testing Every Day

Engineers test many designs. They look at results to choose the best one.

How do we know which idea is better? We test and compare! That is what you will learn today.

SECTION 2

Big Ideas About Testing Designs

When we want to solve a problem, we can make more than one idea. Then we test each idea. We look at the results. That means what happens when we try it.

Design

A design is a plan you make. That means your idea for how to build something.

Test

A test is when you try your design. That means you see if it works!

Results

Results are what you see happen. That means what your eyes and hands tell you.

Compare

To compare means to look at two things side by side and see what is different.

✦ KEY TAKEAWAY

Think about tasting two cookies. You bite one, then the other. You decide which one you like more. That is just like comparing results! You try both and then pick the better one.

SECTION 3

See How We Compare Designs

Let's look at a picture! Two friends each built a ramp for a ball. They want to see which ramp makes the ball roll farther.

Ramp A is short. The ball rolled a little. Ramp B is tall. The ball rolled very far! The results show us Ramp B works better for rolling far.

We looked at both ramps. We saw what happened. Now we can explain which one is better. The tall ramp made the ball go farther!

SECTION 4

How Do We Use Results?

Here is how engineers think. They follow steps. You can follow them too!

Steps Engineers Follow

Step 1: Build two designs.
Step 2: Test each one the same way.
Step 3: Watch what happens. Those are your results!
Step 4: Compare the results side by side.
Step 5: Tell which design worked better and why!

⚠️ Important!

We must test each design the same way. That means it is a fair test. If we push one ball hard and the other soft, that is not fair!

When the test is fair, our results help us. We can trust what we see.

SECTION 5

The Rainy Day Umbrella Challenge

Here is our anchoring phenomenon. That means a real problem we can explore!

It is raining! Two kids each made a tiny umbrella for a toy bear. They want to keep the bear dry. Which umbrella works better?

Umbrella A was made of paper. It got soggy and the bear got wet. Umbrella B was made of plastic. It kept the water out! The results show that the plastic umbrella works better.

We used our eyes to see what happened. We looked at the results. Then we could explain which umbrella was better. That is what engineers do!

SECTION 6

Let's Try It Together: The Bridge Challenge

Two kids built bridges out of blocks. They put a toy car on each bridge. Let's use the results to say which bridge is better!

Which Bridge Holds the Car?

Step 1 — Look at the Two DesignsBridge A uses 3 flat blocks. Bridge B uses 5 blocks stacked in an arch shape.

Step 2 — Test Each Bridge the Same WayWe put the same toy car on each bridge. We use the same car so the test is fair.

Step 3 — Watch What Happens (Results!)Bridge A bends and the car falls. Bridge B stays strong and holds the car.

Bridge A: car falls. Bridge B: car stays!

Step 4 — Compare the ResultsBridge A could not hold the car. Bridge B did hold the car. Bridge B did a better job.

Step 5 — Explain Which Design Works BetterWe can say: Bridge B works better because it held the car without falling. The arch shape made it stronger.

Bridge B is the better design!

Great job! You used results to explain which bridge works better. You think like an engineer!

SECTION 7

What Makes a Good Test?

Not all tests are the same. Some tests give us good results. Some do not. Let's see why!

Fair tests help us trust our results.

What We Do	Fair Test? ✅ or ❌	Why?
Use the same ball on both ramps	✅ Fair!	Same ball means we can compare.
Push one ball hard, let the other roll	❌ Not fair!	The push changes the result.
Pour the same water on both umbrellas	✅ Fair!	Same water means we can compare.
Test one boat in a bathtub, one in a puddle	❌ Not fair!	Different water changes the result.

✦ KEY TAKEAWAY

Think about a race with your friend. You both start at the same line. That is fair! If one person starts way ahead, the race is not fair. Fair tests work the same way. Keep everything the same except the one thing you are testing.

SECTION 8

What Can We Do After We Compare?

After we find the better design, we can do even more! Engineers do not stop. They keep making things better.

Engineers always keep improving!

What We Do Now	What Comes Next
Pick the design that worked better.	Try to make it even better!
Tell a friend which design won.	Ask your friend for new ideas!
Look at what did not work.	Think about why and fix it.

As you grow, you will learn to test harder problems. But the idea is always the same: try, test, compare, and explain!

SECTION 9

Practice Time!

Two friends made paper airplanes. Plane A is long and thin. Plane B is short and wide. They threw each plane three times in the same room. Plane A flew far every time. Plane B fell quickly every time.

PROBLEM 1 — CONCEPTUAL

What are "results"? A) The plan you make before building. B) What happens when you test something. C) The color of your design.

PROBLEM 2 — BASIC

Which paper airplane flew farther? A) Plane A — the long, thin one. B) Plane B — the short, wide one. C) They both flew the same.

PROBLEM 3 — INTERMEDIATE

Was this a fair test? Both planes were thrown in the same room the same way. A) Yes, because they tested both planes the same way. B) No, because the planes are different colors. C) No, because one plane is bigger.

PROBLEM 4 — APPLIED

Your friend says, "Plane B is better because it is prettier." Is that a good reason? Why or why not? A) Yes, pretty things are always better. B) No, we should use the test results to decide. C) Yes, because colors help planes fly.

PROBLEM 5 — CRITICAL THINKING

Think and share: What could you change about Plane B to make it fly farther? Tell a friend or a grown-up your idea and explain why you think it would work.

SUMMARY

What Did We Learn?

When we have a problem, we can make two designs. We test each one the same way so it is a fair test. We watch what happens and collect our results.

Then we compare the results side by side. We use what we see to explain which design works better and tell why. That is how engineers solve problems. And you can do it too! 🌟