Learning Targets
- Use design criteria to compare multiple concepts.
- Score concepts using a decision matrix.
- Justify the selected concept with evidence and tradeoffs.
IED Unit 5 • Lesson 5.6
Decision Matrix and Final Concept Selection
Focus question: How can engineers choose a design concept using evidence instead of personal preference?
Mission Briefing
Today’s Plan
Use this page with the lesson presentation, your engineering notebook, and the tools or evidence assigned for Select the Capstone Concept with Evidence.
Success Looks Like
You can use a decision matrix to compare concepts and justify a final concept selection.
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Opening Prompt
How can engineers choose a design concept using evidence instead of personal preference?
Connect your response to the decision, evidence, or quality standard required for Select the Capstone Concept with Evidence.
Reveal: useful engineering move
This lesson is ready to move forward when the evidence meets this standard: The selected concept is supported by the matrix and the justification acknowledges weak evidence or risk.
Core Skill
What We Are Practicing
A decision matrix makes concept selection more transparent.
Scores should connect to criteria, not popularity.
The best concept is the one that best fits the defined problem and constraints.
Your Task
Select the Capstone Concept with Evidence
Use weighted criteria and research evidence to compare the concepts and choose a defensible direction.
- Confirm that the matrix criteria match the design brief.
- Set and justify criterion weights.
- Score each concept using known evidence.
- Select the concept and document uncertainty or needed proof.
Quality check: The selected concept is supported by the matrix and the justification acknowledges weak evidence or risk.
Lesson Interactive
Select a Concept with a Weighted Decision Matrix
Weights represent criterion importance. Calculate each concept’s weighted total, then select the highest-scoring concept.
| Concept | Usability ×4 | Reliability ×3 | Sustainability ×2 | Weighted total |
|---|---|---|---|---|
| A: Quarter-turn cam | 3 | 4 | 5 | |
| B: Captive sliding pin | 5 | 3 | 4 | |
| C: Magnetic latch | 4 | 5 | 2 |
Multiply each rating by its weight, add the products, and use the total—not personal preference.
What You Will Submit
Concept Selection Evidence
Submission standard: The selected concept is supported by the matrix and the justification acknowledges weak evidence or risk.
Resources
Lesson Resources
Lesson 5.6 PowerPoint
Use the lesson slides for guided practice, interactive checks, and the exit ticket.
Introduction to Engineering Design
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