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Constructing Effective Structures: Design Challenges and Reflections

In this lecture, students engage in a hands-on design exercise to create a structure using Play-Doh, wire, paper, and dowels. The goal is to build a structure that spans two bases and can support a full can of Play-Doh for at least 15 seconds. Students will go through two design phases, present their designs, and reflect on their process, constraints, and learnings from the exercise. Additionally, students will read and summarize key lessons from a text by Alex Baker and discuss their insights in the following week.

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Constructing Effective Structures: Design Challenges and Reflections

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  1. Informatics 121Software Design I Lecture 2 Duplication of course material for any commercial purpose without the explicit written permission of the professor is prohibited.

  2. Today’s lecture • One design exercise • Reflection • Second assignment • Note: there will be a discussion Friday

  3. Your third design exercise • Design and build a structure that spans two bases… • …such that the distance between the two bases is maximized… • …out of Play-Doh, wire, paper, and dowels… • …in 1 hour. • (We will take some pictures)

  4. Available materials • 8 dowels • 3 feet of wire • 10 sheets of paper • 3 large cans of Play-Doh

  5. Process • Design, phase 1 20 minuteshand in 3 different candidate designswith rationale • Build, phase 1 15 minutes • Design, phase 2 15 minuteshand in 1 final designwith rationale • Build, phase 2 10 minutes

  6. Constraints • The structure must be able to suspend, for a minimum of 15 seconds, one large, full can of Play-Doh • in the middle of the structure • in one other place of your choosing • not overlapping with a base • not overlapping with the middle • The dowels and paper must remain in tact • The structure as built should reflect the design you specified • During design, you have no access to materials

  7. Hint • Use the build phase 1 wisely • what do you need to know for design phase 2?

  8. Prize • Each member of the winning team receives a $25 Amazon.com gift card • The longest span wins • as long as it reflects the design you specified

  9. Reflection • How much could you draw upon your existing knowledge of bridges?

  10. Reflection • How did you know what would and would not work?

  11. Reflection • How useful was it to create three designs in phase 1?

  12. Reflection • Did you attempt to build all three designs in phase 1?

  13. Reflection • What did you learn during the first build phase?

  14. Reflection • What did your second design phase focus on?

  15. Reflection • Could you faithfully build your final design?

  16. Reflection • Did you faithfully build your final design?

  17. Reflection • Did you feel constrained by your design when you were building in phase 2?

  18. Reflection • What was the most valuable phase, and why?

  19. Reflection • Would you rather have had a single, 1 hour long, build phase?

  20. Reflection • Did you want more time to experiment (i.e., build phase 1)?

  21. Reflection • Did you want more time to design?

  22. Reflection • What is the key idea underlying your final design?

  23. Reflection • What influence did the constraints have? • limited materials • supporting a can of Play-Doh in two places • nature of the bases • limited build time • …

  24. Reflection • How did you negotiate these constraints?

  25. Reflection • Which representation(s) did you use while designing?

  26. Some past examples

  27. Second assignment • Read “Chapter 1” by Alex Baker, Marian Petre, and André van der Hoek • available on the class web site • Provide a 1 page summary highlighting… • …five major lessons to learn from this text • …how these lessons relate to the design exercises we performed in class today • Due Monday

  28. Discussion • Half the class this Friday • Half the class next Friday

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