OpenSciEd Elem 4.2 (Grade 4 energy/electricity) - fifth OpenSciEd unit confirming program-wide pattern: 92.9% practices + 0% Foundation. EIGHT explicit mechanism deferrals in About the Science (most in any OpenSciEd unit) - including spinning magnets, photovoltaic effect, light waves, sound waves. Five-for-five.
| Program | OpenSciEd Elementary |
| Unit | Grade 4, Unit 4.2: How do we power clocks and other devices? (Energy Transfer: Electricity) |
| Publisher | OpenSciEd |
| Author | OpenSciEd Curriculum Development Team |
| Grade Band | Grade 4 (K-5 calibration applied) |
| NGSS Alignment | 4-PS3-2, 4-PS3-4, 4-PS4-3, 4-ESS3-1, 3-5 ETS1-1 |
OpenSciEd Elementary Unit 4.2 scores Foundation 0% - at the framework floor, identical to OpenSciEd Units 1.1, 2.2, 3.1, and 4.1. Zero map errors across 34 student-facing passages. Zero confirmed FSEs after rigorous review. The adjusted gap is 100% - all 15 mechanism passages are UNSCAFFOLDED because the unit contains no atomic, molecular, or particulate content. This is an unusually explicit author intent. The "About the Science" section makes EIGHT distinct mechanism deferrals: (1) "forms of energy" as substance language, (2) potential/kinetic energy, (3) energy storage in substances, (4) sound waves / air particles, (5) light waves, (6) wireless info as radio/EM signals, (7) volt as a physical concept, (8) generator mechanism (spinning magnets) + photovoltaic effect. Plus a ninth deferral, conservation of energy. Every one of these is what an atoms-first or mechanism-first energy unit would put at the center.
Practices score 92.9% green - high, matching OpenSciEd 1.1, 2.2, 3.1, 4.1. OpenSciEd's pattern is consistent across five grade levels and five distinct NGSS bundles. The two consecutive Grade 4 units (4.1 + 4.2) together demonstrate the program's atoms-deferral choice across a complete year of physical science.
The unit is organized in three lesson sets across 14 lessons.
Lessons 1-8 (Electricity and Energy Transfer): Students compare a winding clock and a plug-in clock (L1), dissect both (L2), build battery-LED circuits (L3), tour their school for power wiring (L4), investigate wind turbines (L5), sort information cards about all energy sources (L6 - "For almost all of them, hot water or steam is used to turn a turbine"), and fair-test solar panels (L7). Lesson 8 synthesizes: "We can trace energy from the sun through a solar panel and to a motor that spins when light is present."
Lessons 9-11 (Information Transfer): Full engineering design cycle - students design, build, test, and optimize devices for communicating time across a distance (L9-L10). L11 introduces digital code as patterns of on/off in electrical current or light.
Lessons 12-14 (Environmental Impact + Mars Capstone): Students research environmental effects of energy sources and present findings (L12-13). L14 is the capstone - design power and communication systems for a Mars rover.
"4-PS3-2 Make observations to provide evidence that energy can be transferred from place to place by sound, light, heat, and electric currents. (Assessment Boundary: Assessment does not include quantitative measurements of energy.)" (Unit Overview, p. 14)
NGSS 4-PS3-2 explicitly bounds the unit to qualitative, observable energy transfers.
The author voice avoids substance framing: "forms of energy" is not used because it "would imply that heat, sound, and motion exist as distinct entities. Energy is energy." (About the Science, p. 48)
A clear anti-REI-substance framing in OpenSciEd Elementary. Worth quoting in any conceptual-error analysis.
Mechanism explicitly deferred: students are "not expected to understand the mechanisms for how electricity is generated." Instead they "look for evidence that energy transfer is happening." (About the Science, p. 50)
Explicit deferral of the generator mechanism and photovoltaic effect. Author voice names the mechanism (spinning magnets) and explicitly excludes it from student-facing content.
"At this grade level, students are not expected to understand that sound travels as a wave or pushes air particles as it moves." (About the Science, p. 49)
Explicit deferral of the particle model of sound.
The coal-to-classroom energy chain is described as a sequence of observable transfers — burning heats water, steam spins a turbine, a generator produces electrical current carried "through wires and into our classroom." No atomic or molecular mechanism at any step. (About the Science, p. 50)
The unit's complete macroscopic energy chain. Every step observable; combustion chemistry, kinetic theory of heat, electromagnetic induction, and electron flow all deferred.
"Energy can be transferred from place to place by electrical currents/electricity, as long as it has a path to move along. Batteries can transfer energy through wires to other objects." (Lesson 3)
Central macroscopic explanation of electric current. No electrons named.
Practices: 92.9% (green tier - high, fifth OpenSciEd unit to match). Six of seven NGSS practices PRESENT; mathematics PARTIAL. Distinctive strengths over and above Unit 4.1: three engineering design loops (L9-10 information transfer; L12-13 energy-source evaluation; L14 Mars rover capstone) - an engineering-rich unit in OpenSciEd Elementary units reviewed. Define-design-test-optimize cycle fully present. Real-world environmental decision-making in L12-13. Mathematics PARTIAL by NGSS-aligned design (assessment boundary explicit: "does not include quantitative measurements of energy").
Option A (lift to Rewrite, ~30-50%): Add one teacher's note in Lesson 3: "Inside the wires of an electric circuit, tiny pieces called electrons are moving - that's what 'electric current' really is."
Option B (lift to Conditional, ~60-70%): Add teacher's notes in Lesson 5 (generator mechanism) and Lesson 7 (photovoltaic effect). About the Science already names "spinning magnets" as the deferred mechanism - Option B would simply un-defer it.
Option C (push to Recommended, ~80%+): Restructure L3 to introduce electrons as current-carriers; restructure L5 to introduce Faraday's law qualitatively; restructure L7 to introduce the photovoltaic effect at an introductory level.
| Total Passages Scored | 34 |
| Raw Gap Error | 100.0% (zero atomic content in unit) FALSE = atoms/molecules not present before students are asked to explain. The student is navigating without a starting point. |
| Adjusted Gap Error | 100.0% (all 15 mechanism passages UNSCAFFOLDED - EIGHT explicit mechanism deferrals in About the Science) UNSCAFFOLDED = no atomic grounding at all. LESSON_ATOMS = atoms mentioned elsewhere in lesson but not connected to this concept. |
| Substance-Model Errors (REI) | 0 Curriculum treats a process or outcome as a substance - "heat flows," "energy is stored," "electricity flows like water." Student builds a substance ontology. |
| Label-as-Explanation (LAE) | 0 Curriculum provides a name and treats it as an explanation - "this happens because of gravity." Student believes knowing the name IS understanding the concept. |
| Vague-Entity Errors (AEC) | 0 Curriculum uses vague entities ("tiny particles," "building blocks") without specifying atoms or molecules. Student invents their own model with macroscopic properties. |
| Factual Science Errors (FSE) | 0 Statements that are scientifically incorrect - not imprecise framing, but wrong. Any confirmed FSE = Not Recommended. |
| Practices | 92.9% - Deep Seven practices scored PRESENT, PARTIAL, or ABSENT and averaged: asking questions, developing and using models, planning and carrying out investigations, analyzing and interpreting data, using mathematics, constructing explanations and designing solutions, and argument from evidence. Higher is better, the opposite direction from gap and map errors. Reported but not part of the Foundation Score or the verdict. |
OpenSciEd Elementary 4.2 is the SECOND consecutive Grade 4 unit. The program-wide pattern is consistent across five grade levels and five distinct NGSS bundles. This unit has an unusually explicit author-intent atom-deferral - EIGHT distinct mechanism deferrals in About the Science. The two Grade 4 units (4.1 + 4.2) together demonstrate OpenSciEd's atoms-deferral choice across a complete year of physical science.
Exemplary inquiry pedagogy. Five Intentionally Developed Practices. THREE engineering design loops (L9-10, L12-13, L14 Mars rover) - most engineering-rich OpenSciEd Elementary unit reviewed. School tour L4 ties NGSS content to students' immediate environment. Real-world environmental decision-making L12-13. Mars rover capstone integrates physical science, engineering, and information-transfer.
shallow by design - Zero MISCONCEPTION_BY_DESIGN flags. Energy correctly framed as a transferable quantity, NOT as a substance - and the "About the Science" section makes this anti-REI-substance choice unusually explicit. Eight distinct mechanism deferrals: forms-of-energy, potential/kinetic, energy-storage-in-substances, sound waves, light waves, wireless-info-as-EM, volt-as-concept, generator mechanism + photovoltaic effect. Plus a ninth: conservation of energy. All consistent with NGSS K-5 scope.
Evidence for every entry is published at three levels. Each level states what it contains and what it leaves out.
Scores, verdict, and the full pattern count for this unit are above: adjusted gap, REI / LAE / AEC counts, FSE status, and the seven-practice score. The analysis quotes 6 passages verbatim from the curriculum.
This file covers the unit scored on this page.
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