Hands-on Activity: Design Step 1: Identify the Need
Educational Standards :
Pre-Req Knowledge (Return to Contents)
A basic understanding of the steps of the engineering design loop. While these steps are not covered in this activity, a visual aid is provided for review.
Learning Objectives (Return to Contents)
After this activity, students should be able to:
Materials List (Return to Contents)
Each group needs:
For the entire class to share:
Introduction/Motivation (Return to Contents)
(Have an overhead transparency of the Engineering Design Loop Visual Aid ready to display in a prominent place in the classroom, or else make copies of the same graphic to use as handouts.)
Today we are beginning an engineering design project! Similar to real-world engineering, our project requires strong teamwork, research, design, building, testing and communication. You will have a chance to get creative and work hands-on with a variety of materials. However, before we can dive into the design/build/test stages, let's take a start at the beginning and gather some information about the project.
(Show the design loop graphic by overhead projection or handout.) First, let's review the engineering design loop. Remember, the engineering design process is a specific set of steps that engineers use to organize their ideas and refine potential solutions to engineering challenges. Who remembers all of the steps? The steps include: identify the need, research the problem, develop possible solutions, select the most promising solution, construct a prototype, test and evaluate the prototype, communicate the design, and redesign.
Following this process, we start out by identifying the need for our engineering project. Instead of asking "what do we want to design?" we ask "why do we want to design that?" and "what problem and or need will our design ultimately be solving?"
Next, we want to identify our target population, which is the group of people who will benefit from our project. Is the target population ultimately one individual, a group of individuals, a specific community, or a larger, identifiable population? Is the target population from a specific location (country, region, town), demographic (age or gender), or other identifying characteristics (health condition or employment)? How is our target population connected?
After we understand our project need and our target population, we will identify our project's requirements and constraints. A requirement is a need or a necessity; it's what a particular product or service should do. A constraint is a restriction on the degree of freedom you have in providing a solution to a need or problem. For example, you may be required by your parents to receive good grades. At the same time, you may be constrained by other activities such as work, sports, sleep, spending time with friends, and so on. Although worthwhile, these time constraints may impinge on the amount of time you have to study. So, your challenge would be to find out how to meet the requirement of receiving good grades under the given time constraints.
Back to our engineering project — our final step today is to develop a project definition within each of our design teams. This includes relating the project's problem or need to some aspect of our personal lives. Ultimately, we want to design something that would help us if we were experiencing the same problem or need as our target population.
(Note: After conclusion of this activity, proceed to the next activity in the series, Design Step 2: Research the Problem.)
Vocabulary/Definitions (Return to Contents)
Procedure (Return to Contents)
Creating a Project Description: Before beginning this set of six activities (starting with this activity), determine a topic for the class design challenge and create a one-page Design Challenge Project Description patterned after the attached Example Design Challenge Project Description. Alternatively, engage the class to brainstorm a design challenge, or use the attached example. For the example description, as well as the ongoing activity write-up (all six activities), the project challenge is to design a prosthetic arm that can perform a mechanical function. Topics for project challenges are limitless; other successful ideas used in the past with high school students include: house design with elements inspired by nature (biomimicry); assistive technology devices; towers (tested in a university smash lab); amusement park rides; daylighting modifications to existing interior spaces; interactive table-top educational exhibits, and different solar and water technologies for use by a hypothetical developing community.
If you write a project description or brainstorm a topic with the class, clearly outline the design challenge objectives and your project expectations. Provide a relevant context to help the students:
Recognizing the Need: Often, the success of an engineering innovation depends on the satisfaction of the end user(s). For instance, an engineering team designing a water filter might begin by asking themselves "What is the real need for this project? Is it designing a water filter or, more generally, designing a means to purify water?" By doing this, the team may discover that starting the design process with the intent to meet this more general need "frees" them to generate solutions that extend beyond a water filter.
Identifying a Target Population: A target population is an identified group of people intended to be served by a particular program or project. We might describe a target population by its geographical location (country, region, town, etc.) as well as by its age group, gender, or condition (for example, a health condition). Identifying a target population helps engineers more accurately define the problem and recognize requirements and constraints.
Relating to the Project: As an example, a project description to design an electricity-generating waterwheel might begin with a discussion about a community that lacks electricity. Students could discuss how a rural electrification project could meet the need for community residents who want to boil water, read at night, and so on. To help students relate to the project, ask them to discuss how their own lives would be impacted if they did not have access to electricity.
Requirements and Constraints: Write the project description so that students can identify and differentiate requirements and constraints. A requirement is a need for what a particular product or service should do. It is a statement that identifies a necessary attribute, capability, characteristic or quality. A constraint is a restriction on the degree of freedom you have in providing a solution. Constraints might be economic, political, technical, environmental, and/or pertain to your project resources, schedule, target environment, or to the product itself.
For example, a design challenge might ask students to build a pair of recyclable tennis shoes for less than $20. The requirement that the tennis shoes be recyclable and cost less than $20 will likely constrain the design to inexpensive materials that students can find in recycling bins.
Sometimes we call this process "design under constraint." Real-world limits such as these often boost creativity as engineers (and students!) are challenged to make more with less.
Engineering Design Loop: The steps of the design process include: identify the need, research the problem, develop possible solutions, select the most promising solution, construct a prototype, test and evaluate the prototype, communicate the design, and redesign. See the Engineering Design Loop Visual Aid. This activity focuses on the first step, identify the need.
Before the Activity (Teacher Prep)
With the Students
1. Divide the class into groups that will keep the same team members throughout the design project (all six activities). The optimal group size is 3 to 5 students each.
2. Review the engineering design loop by conducting the pre-activity assessment described in the Assessment section. This asks the teams to engage in a 10-minute design challenge and record their efforts to complete each step in the process. As a class, discuss any questions that arise about the design loop.
3. Introduce the design challenge. As a class, review the Design Challenge Project Description (as previously written by the teacher or brainstormed/written by the class, or attached to this activity).
4. Use the Investigating Questions to lead a class discussion about how to recognize the need and identify a target audience for a hypothetical engineering project.
5. Give each team a copy of the Defining the Problem Worksheet. So students thoroughly define their projects, make sure they consider each worksheet question. Help them complete this worksheet as questions arise.
6. When worksheets are completed, lead a class discussion to explore students' responses to the worksheet questions. Ask each team to present their answers to one section of the worksheet.
7. To conclude, conduct the post-activity assessment described in the Assessment section to help students relate the project to some aspect of their own lives. This role-reversal exercise asks students to imagine they are members of the target population and develop three questions that they would ask the project engineers. Share some of these as a class.
Attachments (Return to Contents)
Troubleshooting Tips (Return to Contents)
If you have trouble coming up with a design challenge, it helps to brainstorm with the students. Choose a topic (for example, prosthetics), and make a list on the board of potential design/build projects that relate to the topic. See the Teacher Background section for other topic ideas.
Investigating Questions (Return to Contents)
Use the following discussion questions to help students gain understanding of two important aspects of engineering problem solving: recognizing a need and identifying a target audience.
Assessment (Return to Contents)
Warm-Up Design Challenge: Lead students through a quick and simple design challenge to help them review the steps of the engineering design loop and begin to work with their teammates. Their team challenge is to construct the tallest tower possible in 10 minutes using only the given (3 to 5) index cards and a pair of scissors. No external support (such as textbooks) or adhesives are allowed. Alternative materials: Provide 1 or 2 sheets of cardstock instead of index cards. Additional requirement idea: The tower must stand on its own for at least 10 seconds.
To start the challenge, project the Engineering Design Loop Visual Aid in front of the class (or provide as a handout) and direct the teams to follow these steps as they design the towers. Designate one person to be each team's reporter to record their progression through the process as they solve the tower challenge. As an example, recorders may write something like the following:
After 10 minutes, bring together the class to compare team notes about the engineering design loop and discuss the process. Some questions to ask the students:
Worksheet: Give each team a copy of the Defining the Problem Worksheet. Teams should thoughtfully complete this worksheet either in class or as a team homework assignment. Once the teams have compiled their answers, lead a class discussion and ask each team to present their answers to one section of the worksheet.
Relating to the Project – Role Reversal: Have students imagine that they are members of the target population experiencing the problem and/or need outlined in the design challenge. From the point-of-view of a member of the target population, have each team develop three questions that they would ask the project engineers about the challenge. Share some of these as a class. If time permits, ask each student to write a short letter to a (hypothetical) engineer explaining how his or her life is impacted by the problem and/or need. How would his or her life, family and community be different if this need or problem were resolved?
Activity Extensions (Return to Contents)
Case Studies: Have each team research an engineering design product that is related to their assigned design challenge and present the research as a case study to the class. Require that information provided in the case study identify the need for the project, target population, requirements and constraints, as well as provide a description of the engineering solution and an assessment of whether or not the solution met the target population need.
Additional Multimedia Support (Return to Contents)
For a description of the engineering design process, see http://www.teachengineering.org/engrdesignprocess.php
References (Return to Contents)
Target Population (definition). Program Evaluation Glossary. US Environmental Protection Agency. Accessed January 8, 2010. http://ofmpub.epa.gov/sor_internet/registry/termreg/searchandretrieve/glossariesandkeywordlists/search.do;jsessionid=mJCLP7qhS3htvXDpvyMf7ZlqpnVNMCPtGDCFTHL81hnT30TML4X7!-343254326?details=
Yowell, J.L. and Carlson, D.W., Eds., Introductory Engineering Design: A Projects-Based Approach, Third Edition, Textbook for GEEN 1400: First-Year Engineering Projects, Integrated Program, College of Engineering and Applied Science, University of Colorado at Boulder, Fall 2000. Accessed April 8, 2010. http://itll.colorado.edu/index.php/courses_workshops/geen_1400/resources/textbook/
ContributorsLauren Cooper, Malinda Schaefer Zarske, Denise W. Carlson
Copyright© 2008 by Regents of the University of Colorado.
Supporting Program (Return to Contents)Integrated Teaching and Learning Program, College of Engineering, University of Colorado Boulder
Acknowledgements (Return to Contents)
The contents of these digital library curricula were developed by the Integrated Teaching and Learning Program under National Science Foundation GK-12 grant no. 0338326. However, these contents do not necessarily represent the policies of the National Science Foundation, and you should not assume endorsement by the federal government.