Specify qualitative and quantitative criteria and constraints for solutions that account for societal needs and wants

Standards Alignment

• HS-ETS1-1 primary
  Analyze a major global challenge to specify qualitative and quantitative criteria and constraints for solutions that account for societal needs and wants.

Lesson Overview

This Grade 12 science lesson engages students in analyzing major global challenges to specify both qualitative and quantitative criteria and constraints for engineering solutions that address societal needs and wants. Students explore how engineering design can be applied to complex real-world problems by breaking them down, prioritizing criteria, and considering societal and environmental impacts. Through modeling, evidence analysis, and discussion, learners develop skills to define problems and evaluate potential solutions in alignment with NGSS HS-ETS1-1.

Learning Objectives

• Analyze a major global challenge by identifying qualitative criteria that solutions must meet to address societal needs and wants.
• Specify quantitative criteria and constraints that solutions must satisfy to be effective and feasible.
• Explain how societal needs and wants influence the criteria and constraints for engineering solutions.
• Use evidence and disciplinary reasoning to justify the selection of criteria and constraints for a given global challenge.
• Revise problem definitions or solution criteria based on analysis and feedback to better meet societal needs.

Success Criteria

• Students can identify and describe both qualitative and quantitative criteria relevant to a global challenge.
• Students can explain constraints that limit possible engineering solutions, including societal and environmental considerations.
• Students can use evidence to support their reasoning about criteria and constraints.
• Students can revise their criteria or constraints after receiving feedback or analyzing new information.
• Students can communicate their analysis clearly in discussion or written form.

Prerequisite Knowledge

Students should understand basic concepts of engineering design, including the idea of criteria and constraints, and have experience with analyzing problems and using evidence to support explanations.

Key Vocabulary

• Engineering design
• Criteria
• Constraints
• Qualitative criteria
• Quantitative criteria
• Societal needs
• Societal wants
• Global challenge
• Trade-offs
• Modeling
• Simulation

Materials and Resources

• Whiteboard or chart paper
• Markers
• Projector or computer for simulations or data presentation
• Handouts with data or case studies on a major global challenge (e.g., clean water access, food security)
• Student notebooks or digital devices for note-taking

Teacher Preparation

• Select a major global challenge relevant to students' context (e.g., clean water scarcity, renewable energy) with available data or case studies.
• Prepare diagrams, data sets, or simulations illustrating aspects of the challenge.
• Prepare guiding questions to prompt analysis of criteria and constraints.
• Arrange classroom seating to facilitate group discussion and collaboration.

Detailed Lesson Notes

Understanding Engineering Design and Its Stages

Engineering design involves three main stages: defining the problem, developing possible solutions, and improving designs. At the high school level, defining the problem requires both qualitative and quantitative analysis to understand the scope and impact of the challenge. For example, addressing food and water needs involves understanding population growth rates (quantitative) and social equity issues (qualitative).

Qualitative and Quantitative Criteria and Constraints

Criteria are the desired features or requirements that a solution must meet, such as safety, reliability, or environmental protection. Constraints are the limitations or restrictions on the solution, such as cost, available materials, or time. Qualitative criteria describe qualities or characteristics (e.g., user-friendliness, aesthetics), while quantitative criteria involve measurable factors (e.g., maximum cost, minimum efficiency).

Societal Needs and Wants in Engineering Solutions

Engineering solutions must account for societal needs (essential requirements like clean water) and wants (preferences or desires such as convenience). These influence which criteria and constraints are prioritized. For instance, public safety might be prioritized over cost when designing water purification systems. Understanding societal context helps engineers balance trade-offs and design effective solutions.

Analyzing a Major Global Challenge

Students analyze a global challenge by gathering data and information to specify relevant criteria and constraints. This includes identifying what the solution must achieve (criteria) and what limits exist (constraints). For example, in addressing clean water scarcity, criteria might include water purity levels (quantitative) and accessibility (qualitative), while constraints might include budget limits and environmental regulations.

Using Evidence and Models to Support Reasoning

Students use evidence such as data, simulations, or case studies to justify their specified criteria and constraints. Models can help visualize the problem and potential solutions, allowing students to test assumptions and anticipate impacts. Revising criteria or constraints based on new evidence or feedback is an important part of the engineering design process.

Worked Examples

Classroom Activity

Work individually or in groups to analyze the provided information. List criteria and constraints that solutions should meet or respect.

Guided Practice

Independent Practice

1. Foundational: Define what is meant by 'criteria' and 'constraints' in engineering design.
2. Developing: List one qualitative and one quantitative criterion that might be important when designing a solar-powered water pump.
3. Application: Given a scenario where a community needs affordable and reliable energy, specify two constraints that engineers must consider when designing a solution.
4. Analysis: Explain why prioritizing criteria is important when engineering solutions for complex global challenges.
5. Challenge: A proposed solution to reduce pollution is very effective but very expensive and difficult to maintain. Discuss how you would revise the criteria and constraints to address societal needs and wants.

Independent Practice Teacher Answer Key

1. 1. Criteria are the desired features or requirements that a solution must meet, while constraints are the limitations or restrictions that the solution must operate within.
2. 2. Qualitative criterion: The pump should be easy to operate by local users. Quantitative criterion: The pump must provide at least 100 liters of water per hour.
3. 3. Constraints could include a maximum cost limit to ensure affordability and the availability of local materials to ensure reliability and ease of maintenance.
4. 4. Prioritizing criteria is important because some factors, like public safety or environmental protection, may be more critical than others such as cost or aesthetics. Prioritization helps engineers make trade-offs and design solutions that best meet the most important societal needs.
5. 5. I would revise the criteria to balance effectiveness with affordability and maintainability, possibly lowering the cost and ease-of-use requirements to ensure the solution is practical for society. Constraints might be adjusted to allow for some pollution reduction rather than complete elimination if that enables a more feasible solution.

Guiding Questions

• What are the key needs and wants of society related to this challenge?
• Which criteria are qualitative and which are quantitative?
• What constraints limit possible solutions?
• How do we prioritize criteria when they conflict?
• How can we revise our criteria and constraints when conditions change?

Common Misconceptions

• All criteria are equally important and should be treated the same.
• Constraints only limit solutions and do not influence design choices positively.
• Quantitative criteria are always more important than qualitative criteria.
• Engineering solutions can perfectly solve global challenges without trade-offs or revisions.

Differentiation

Assessment

• Ask students to explain the difference between qualitative and quantitative criteria with examples.
• Have students list criteria and constraints for a given global challenge and justify their choices.
• Use group discussions to assess understanding of prioritizing criteria and trade-offs.
• Write a brief explanation of why societal needs and wants are important in specifying criteria and constraints for engineering solutions.
• List one qualitative and one quantitative constraint for a solution to a global challenge.
• Develop a detailed analysis of a major global challenge specifying multiple qualitative and quantitative criteria and constraints, including justification based on societal needs.
• Create a presentation explaining how prioritizing criteria affects engineering design decisions and trade-offs.

Answer Guide

• Define criteria and constraints in engineering design.
  Answer: Criteria are the desired features or requirements a solution must meet; constraints are the limitations or restrictions on the solution.
• Identify qualitative and quantitative criteria for a water purification system.
  Answer: Qualitative criteria might include user-friendliness and safety; quantitative criteria might include maximum contaminant levels and cost limits.
• Explain why prioritizing criteria is necessary in engineering design.
  Answer: Because some criteria like safety or environmental protection are more important than others, prioritizing helps make trade-offs and design effective solutions.
• Describe how societal needs influence engineering criteria and constraints.
  Answer: Societal needs determine which criteria are essential and which constraints must be considered, ensuring solutions address real-world problems effectively.
• Explain how you would revise criteria after receiving new information about budget cuts.
  Answer: I would adjust the criteria to lower cost requirements and possibly accept reduced functionality or performance to fit the new budget while still meeting essential needs.

Real-Life Application

Students interview family members or community members about local challenges and discuss what criteria and constraints would be important for engineering solutions that meet their needs and wants.

Homework or Home Connection

• Students interview family members or community members about local challenges and discuss what criteria and constraints would be important for engineering solutions that meet their needs and wants.

Lesson Summary

In this lesson, students learn to analyze major global challenges by specifying both qualitative and quantitative criteria and constraints that engineering solutions must meet to address societal needs and wants. They explore how prioritizing criteria and considering trade-offs are essential in designing effective solutions. Through evidence analysis, modeling, and revision, students develop a deeper understanding of the engineering design process and its impact on society and the environment.

Teacher Notes

Use the exact standards alignment and retrieved-source provenance stored with this enrichment.

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