provided notebook materials from the downloadable Polymers for the Planet unit plan, students continued to work in their classroom interactive notebook, where we recorded vocabulary, formulas, and data throughout the project. We used the
Prepping for the polymers test.
engineering design process diagram to keep us focused throughout the project. Each day we revisited this image and talked about
where we were in the process, and where we were going next.
The CER Framework Arguing from evidence using the CER (Claim, Evidence, Reasoning) format is another new aspect of the NGSS Science and Engineering practices. To help my students, I provided graphic organizers to record their evidence, and used sentence frames to guide their reasoning to support a claim for their redesign. The opportunity for students to use evidence to drive their redesign was powerful — this process helped to solidify for them the importance of using data to drive decisions. After their prototypes were tested, they were eager to find out which formulas yielded the best results, and used this information to make new iterations to their design.
Surprising Outcomes Here’s what we’ve discovered so far:
• When testing tensile strength of the bioplastics, the testing setup failed due to the large amount of weight that the plastics were able to withstand. This led to students engineering and redesigning the test itself! When the provided protocol failed them, they came up with creative solutions and collaborated in ways that I haven’t previously observed. When one group observed another struggling with the same issues, they collaborated to build new solutions and test ideas.
• Of course, not all of the bioplastics were easy to test for various reasons. But because students had a sense of ownership and wanted to test the product they designed, the level of problem solving I observed was far beyond that in previous lab activities. The students were motivated to test and gather data for their samples, and figured out how to make this possible, with very little help from me.
CLEARING Fall 2017
www.clearingmagazine.org Page 25
• I saw opportunities for individual students to shine who didn’t usually do so in class. One particular student became a creative problem solver and designed multiple ways to test tensile strength. He also helped other groups, showing an interest in class that I hadn’t previously seen.
We’re now at the stage of putting it all together. Students are
creating presentations, and in an effort to motivate them to do their best, I’ve invited other adults (teachers, administrators, instructional assistants) to serve as an authentic audience to view the students’ presentations about their engineering design process. Wish them luck!
Kathryn Davis is a science teacher at Hood River Valley High School in Hood River, Oregon. She has been teaching science for 13 years. Kathryn is a Stanford graduate, Teach For America Bay Area alumni, and Amgen Biotechnology Experience teacher. She is currently working as a Professional Growth Coach for her school district and is excited to be a part of Teaching Channel’s Tch Next Gen Science Squad. Connect with her on Twitter: @biokathryn.
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