Generating Multiple Solutions — Generate multiple solutions...

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Why Do Inventors Come Up with Many Ideas?

Have you ever tried to solve a problem and your first idea didn't work? You are not alone! Throughout history, engineers (people who design and build things to solve problems) have learned that coming up with many ideas is the secret to finding the best one.

Think about it this way: if you only try one flavor of ice cream, you might miss your favorite! Engineers think the same way about solutions. They brainstorm lots of ideas before picking the best one to build.

1400s

Leonardo da Vinci's Notebooks

Leonardo da Vinci drew hundreds of sketches for flying machines. He didn't stop at one idea — he filled whole notebooks with different designs!

1879

Thomas Edison's Light Bulb

Thomas Edison tested over 3,000 different ideas before he found the right material for a light bulb that would glow for a long time.

1903

The Wright Brothers' Airplane

The Wright Brothers built and tested many different wing shapes and glider designs before their famous first flight at Kitty Hawk.

2000s

Modern Engineers Today

Today, engineers at companies like NASA brainstorm dozens of ideas for every space mission. They compare solutions to find the safest and smartest one.

The big question engineers always ask is: "What are ALL the ways we could solve this problem?" That question is what this lesson is all about!

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Core Ideas About Generating Multiple Solutions

When engineers face a design problem (a challenge that needs a creative fix), they follow some important rules. These rules help them think of lots of ideas instead of getting stuck on just one.

Understand the Problem First

Before you start solving, make sure you really understand what the problem is. Ask: What needs to be fixed? Who is it for? What rules or constraints (limits) do I have?

Brainstorm Many Ideas

Brainstorming means thinking of as many ideas as you can — even wild or silly ones! Write or draw every idea. Don't judge them yet.

Every Idea Counts

No idea is too weird during brainstorming. Sometimes the craziest idea leads to the best solution. Be open and creative!

Compare Your Solutions

After brainstorming, look at all your ideas. Think about which ones match the criteria (goals) and constraints (limits) of the problem.

Pick and Improve

Choose the best idea, but don't stop there! You can mix parts of different ideas together to make an even better solution.

💡 KEY TAKEAWAY

Generating multiple solutions is like packing for a trip. If you only bring one outfit, you might be too hot, too cold, or too fancy for the occasion. But if you bring several different outfits, you can pick the perfect one for whatever happens. Engineers pack their brains with many ideas so they always have the right solution!

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See How It Works: The Design Process

Let's look at the steps engineers follow. This diagram shows the engineering design process. Notice how generating multiple solutions is right in the middle of the process!

The engineering design process is a cycle. Step 3 — Brainstorm MANY Solutions — is highlighted with a star because it is the focus of this lesson. Notice the dashed arrow from Step 7 back to Step 1. Engineers often go through this cycle more than once!

As you can see, the design process is shaped like a circle. That means engineers can go around the circle again and again. Each time, they learn something new and come up with even better ideas. The star marks Step 3 — brainstorming many solutions — because that is the step we are learning about today.

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How Do Engineers Think of Many Solutions?

There are some fun and easy strategies engineers use to brainstorm. Let's learn three of the most popular ones!

Strategy 1: Free Brainstorming

In free brainstorming, you write down or draw every idea that pops into your head. There is only one rule: no idea is a bad idea. You can judge your ideas later. Right now, just let your brain be wild and free!

Strategy 2: SCAMPER

SCAMPER is a word that stands for seven ways to change an idea. Each letter gives you a new way to think:

S — Substitute: What if I swap one part for something else?
C — Combine: Can I mix two ideas together?
A — Adapt: Can I change it to work in a new way?
M — Modify: Can I make it bigger, smaller, or a different shape?
P — Put to another use: Can I use it for something else?
E — Eliminate: What if I take a part away?
R — Reverse: What if I flip it around or do it backwards?

Strategy 3: Look at Nature

Nature is full of amazing designs! Engineers sometimes look at plants and animals for ideas. This is called biomimicry (copying nature's designs). For example, Velcro was invented by a man who noticed how burrs stuck to his dog's fur!

🧠 KEY TAKEAWAY

Think of your brain like a popcorn machine. When you brainstorm, ideas pop out one after another — some big, some small, some funny. The more kernels you pop, the bigger your bowl of ideas. You can always pick your favorite pieces later!

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How Do You Compare Multiple Solutions?

After brainstorming, you will have a bunch of ideas. But how do you decide which one is best? Engineers use a special chart called a comparison chart. This chart helps you check each idea against the criteria (what the solution must do) and constraints (the limits or rules).

This comparison chart shows three different lunchbox ideas. Each idea is checked against two criteria (keeps food cold and easy to carry) and one constraint (cost). Idea B — the insulated bag — meets the most criteria!

See how having three ideas made it easier to find a good solution? If the engineer had only thought of the big cooler, they would have a lunchbox that is too heavy to carry. By generating multiple solutions, the engineer found one that works much better.

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Worked Example: The Rainy Recess Problem

Let's walk through a full example together. Imagine your school needs a way for students to stay dry while walking from the building to the playground when it rains. Let's follow the steps!

Design Challenge: Rainy Recess Cover

Step 1 — Understand the ProblemStudents get wet when walking from the school door to the playground on rainy days. We need something that blocks rain between the two places.

Criteria: must block rain, must be safe. Constraints: must cost less than $200, must be built in one week.

Step 2 — Brainstorm at Least 3 SolutionsLet's think of several different ideas! Idea 1: Build a wooden roof between the building and playground. Idea 2: Put up a row of large umbrellas. Idea 3: Stretch a big waterproof tarp on poles. Idea 4: Give every student their own poncho.

We now have 4 possible solutions!

Step 3 — Compare Solutions to Criteria and ConstraintsIdea 1 (wooden roof) blocks rain well and is safe, but it costs too much and takes too long to build. Idea 2 (umbrellas) is cheap and fast, but wind could blow them over — not safe. Idea 3 (tarp on poles) blocks rain, is safe when tied down, costs about $80, and can be set up in a few days. Idea 4 (ponchos) keeps each student dry, but kids might lose them, and buying ponchos for everyone costs a lot.

Idea 3 (tarp on poles) meets all the criteria and stays within the constraints!

Step 4 — Improve the Best SolutionWe can make Idea 3 even better! What if we borrow the poncho idea and also keep a basket of ponchos by the door for extra-windy days? This combines the best parts of two ideas.

Final solution: Waterproof tarp on poles + a basket of backup ponchos.

🔍 Did You Notice?

In the final step, we combined parts of two different ideas. This is one of the biggest reasons to generate multiple solutions — you can mix and match the best pieces!

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Why Many Ideas Beats One Idea

You might wonder: why not just go with the first idea that pops into your head? Here is a table that shows the difference between using one solution and using many solutions.

Comparing one idea vs. multiple ideas

	Only One Idea	Multiple Ideas
Creativity	Limited — you might miss better ideas	High — you explore many possibilities
Chance of Success	Lower — if it fails, you have to start over	Higher — you can switch to a backup plan
Comparing & Choosing	Nothing to compare	You can pick the best match for the criteria
Mixing Ideas	No other ideas to borrow from	You can combine the best parts of several ideas
Time Spent	Quick to start, but may waste time if it fails	A little more time brainstorming, but saves time later

🎯 KEY TAKEAWAY

Imagine you are playing a game of darts. If you only throw one dart, you might miss the bullseye. But if you throw several darts, your chances of hitting it go way up! Generating multiple solutions is like giving yourself more darts to throw at the problem.

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From Multiple Solutions to Testing and Improving

Generating multiple solutions is a skill you will use again and again as you learn more about engineering design. In later lessons, you will learn how to test your solutions and make them even better. Here's how today's skill connects to what's coming next.

How today's lesson leads to future skills

What You Learned Today	What Comes Next
Brainstorm many ideas	Build a model (prototype) of your best idea
Compare ideas using criteria and constraints	Test your prototype to see if it really works
Combine the best parts of different ideas	Redesign and improve based on test results
Work on simple school problems	Solve bigger, real-world engineering challenges

Real engineers at NASA, car companies, and toy makers use these same brainstorming steps every day. The more you practice coming up with multiple solutions, the better you will get at solving all kinds of problems — in science class and in life!

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Practice Problems

Now it's your turn! Try these practice problems. Remember — the goal is to come up with many ideas, not just one.

PROBLEM 1 — CONCEPTUAL

Why is it important for engineers to think of more than one solution to a design problem?

PROBLEM 2 — BASIC

Your class pet hamster needs a new toy to play with. The toy must be safe (no sharp edges), fit inside the cage, and cost less than $5. Name at least 3 different toy ideas you could make.

PROBLEM 3 — INTERMEDIATE

Your school garden needs a way to keep birds from eating the seeds before they grow. The solution must not hurt the birds, must last at least two weeks, and must cost under $10. Brainstorm 3 solutions and explain which one best meets all the criteria and constraints.

PROBLEM 4 — APPLIED

Imagine you are an engineer at a toy company. Kids complain that their building blocks fall apart too easily. The new design must hold together better, be safe for kids ages 3 and up, and use materials that are not too expensive. Come up with 3 different solutions. Then make a simple comparison chart (like the one in Section 5) to pick the best one.

PROBLEM 5 — CRITICAL THINKING

Sometimes two people brainstorming together can come up with better ideas than one person alone. Why do you think this is true? How could working with a partner help you generate more and better solutions to a design problem?

SUMMARY

Lesson Summary

In this lesson, you learned that generating multiple solutions is a key part of the engineering design process. When you face a design problem, you should first understand it by identifying the criteria (goals) and constraints (limits). Then, you brainstorm as many solutions as you can — using strategies like free brainstorming, SCAMPER, or looking at nature.

After brainstorming, you use a comparison chart to check each idea against the criteria and constraints. The best part about having many ideas is that you can combine the best parts of different solutions to create something even better. Famous inventors like Edison and the Wright Brothers always generated multiple solutions — and now you can too!