Science City · Case 02Key Language Use: ArgueELD-SC · Language for ScienceAbout 20 minutes · Recommended grades 6-8
Two Filters, One Intake Pipe
Students compare two engineering designs using quantitative test data and argue why a two-stage filter outperforms a single fine screen.
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Standards Architecture
WIDA alignment for practice
Aligned for classroom practice to the WIDA English Language Development Standards Framework, 2020 Edition. This is not an official WIDA score, ACCESS score, or proficiency level.
- Standard: Language for Science
- Key Language Use: argue
- Discourse: An engineering design argument that compares single-stage and two-stage filtration using run-time data and addresses the maintenance tradeoff.
- Sentence: Comparative and causal clauses using whereas, while, because, and therefore.
- Word and phrase: stage, coarse, capacity, duration, tradeoff, evidence, 20 minutes, 90 minutes.
Instructional Guidance
Teaching notes
About 20 minutes. Recommended grades 6-8. Content area: science.
Lesson Objectives
- Argue for an engineering design by comparing quantitative test results.
- Explain how dividing filtration into coarse and fine stages extends operating duration.
Pathway ScaffoldingGuided pathway provides comparative argument frames and a word bank. Developing pathway offers optional starters. Independent pathway adds a cost-and-maintenance table.
Likely language demands
- Students may state that the two-stage filter is 'better' without citing the 20-minute vs. 90-minute test numbers.
- Students may forget to explain what the coarse gravel layer actually traps.
What independent performance looks like
Independent performance contrasts the 20-minute and 90-minute run times, explains the two-stage mechanism, and addresses the rinse-time tradeoff without frames.
Follow-up
- Classroom studio: Data & Visual Evidence Bench (/studios/data-evidence), then History Portal Case 1.