---
title: "Comparing Possible Solutions"
description: "Generate and compare multiple possible solutions to a problem based on how well each is likely to meet the criteria and constraints"
canonical: https://lightmysky.com/learn/science/comparing-possible-solutions-mt_HveO1bOXpJ
source: https://lightmysky.com/learn/science/comparing-possible-solutions-mt_HveO1bOXpJ.md
retrieved: 2026-10-19
---

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# Comparing Possible Solutions

Generate and compare multiple possible solutions to a problem based on how well each is likely to meet the criteria and constraints

Subject: Science · Area: Scientific Inquiry · Ages 8 to 11
Page: https://lightmysky.com/learn/science/comparing-possible-solutions-mt_HveO1bOXpJ

## Ready when they can

- Generate at least three possible solutions to a defined design problem
- Compare solutions against the specified criteria and constraints
- Select the most promising solution with reasoning for the choice

## Lesson: Comparing Possible Solutions

When you have a problem to solve, don't grab the first idea that comes to mind. Think of at least three different solutions. Then compare them to see which one really fits what you need.

*(drawing: Plan B held the most cars, so it best meets the goal of a strong bridge.)*

**Example.** Kai wants to build a bridge for his toy cars. The goal is to hold as many cars as possible, using only ten craft sticks and tape. He tries three plans: a flat bridge holds 2 cars, an arched bridge holds 5, and a layered bridge holds 3. Kai compares the numbers against his goal and picks the arched bridge, since it holds the most cars while still fitting inside the ten-stick limit.

**Tip.** To compare solutions: list every idea, check each one against the criteria and constraints, then pick the one that fits best and be ready to say why.

**Recap.** Compare your solutions against the criteria and constraints, then choose the one that fits best and explain your reason.

## Practice

13 questions on this page, each with its working shown.

## Needs first

- [Simple Design Problems](https://lightmysky.com/learn/science/simple-design-problems-mt_Z5-fSCOBep)

## Opens up

- [Fair testing (age 8+)](https://lightmysky.com/learn/science/fair-testing-age-8-mt_eoPcc4nrBE)