Keisha tested two pencil organizers. Look at the test results. What is a weakness of Design B?
- It holds only 15 pencils
- It takes up more desk space (correct answer)
- It mixes pencils together
- It is hard to find pencils
Explanation: This question tests 2nd grade ability to compare test data and identify strengths and weaknesses of designs (NGSS K-2-ETS1-3: Analyze data from tests of two objects designed to solve the same problem to compare the strengths and weaknesses of how each performs). When we test two designs that solve the same problem, we collect data to compare how well each performs. A weakness is something a design doesn't do as well—an area where it could be improved. In this scenario, both designs solve the problem of organizing pencils on a desk. The test data shows Design A uses less desk space but holds only 15 pencils, while Design B takes up more desk space but holds 20 pencils and keeps them sorted. Choice B is correct because the data shows Design B has a larger footprint on the desk, meaning it takes up more desk space—this is a weakness when desk space is limited. Choice A represents confusing which design has which feature, which happens when students see the capacity numbers and incorrectly assign Design A's limitation (15 pencils) to Design B. To help students compare designs using test data: Model clear thinking—'Design B holds more pencils, which is good, but the data shows it takes up more desk space, which is its weakness.' Use color coding to highlight each design's weaknesses in red.