STEM Challenge - Project Keys to the Kingdom - Create a Button Dichotomous Key

Looking for a flexible, multi-day activity that gets your students “doing science?” Every STEM Challenge offers a hands-on, inquiry-based, student-led project designed to allow them to step into the roles of researchers and engineers.

STEM Challenge projects are ideal for use at any time throughout the school year, between units, before breaks, or during afternoons when testing weeks occur.

For teachers, there are presentations and step-by-step guides to facilitate pacing and lesson plans that align with standards. Students utilize the included notebooks to guide them through activities (both individually and in small groups), challenge them to learn new information, and reflect on and apply the information they have learned. 

The Challenge:

Since the 1700s, scientists have identified organisms using a choice-based system called a dichotomous key. The key uses a series of questions with two options at each step. Answering each question brings you closer to identifying your species. First, you will research dichotomous keys to begin understanding how they function. Next, you will create your own dichotomous key. You will be given a group of unique buttons that each represent an organism from a different species. You will first need to name each of your organisms, then build a dichotomous key based on their characteristics. Finally, you will exchange your key and buttons with another group to see if they can identify each of your organisms. You will do the same with theirs. Good luck!

What’s in a STEM Challenge?

• a video explaining the engineering challenge and setting the context for the project
• a BIG Question to guide the inquiry
• teacher presentation in PPT (Google-compatible) and Keynote
• a teacher's guide on what the teacher and students should be doing along the way
• student notebook offers
  • questions to provide the students with a framework for their inquiry throughout the entire project
  • opportunities to absorb new information and reflect on ways to use it to complete the challenge
• Using the LAUNCH process, students brainstorm with their peers and reflect on failures and opportunities, with the prospect of sharing their ideas with the world. This holds students accountable, and they will put forth the best effort, knowing that other students could critique the project.
• Each STEM Challenge contains a list of suggested supplies for its project. We were very cautious about choosing inexpensive items, and the supply list is dynamic, allowing for adjustments to individual situations. Suggested supplies include: 
  • A large variety of buttons (natural items can be used as well)
    

Supports Next Generation Science Standards:

MS-ETS1-1

Define the criteria and constraints of a design problem with sufficient precision to ensure a successful solution, taking into account relevant scientific principles and potential impacts on people and the natural environment that may limit possible solutions.

MS-ETS1-2

Evaluate competing design solutions using a systematic process to determine how well they meet the criteria and constraints of the problem.

MS-ETS1-3

Analyze data from tests to determine similarities and differences among several design solutions to identify the best characteristics of each that can be combined into a new solution to better meet the criteria for success.

MS-ETS1-4

Develop a model to generate data for iterative testing and modification of a proposed object, tool, or process such that an optimal design can be achieved.