NGSS 1-PS4-aligned with explicit deferrals: light-as-energy → later elementary; speed of light → middle school; reflection's role in seeing → 4th grade. Most extreme practices/foundation split.
| Program | OpenSciEd Elementary |
| Unit | Grade 1, Unit 1.1: How can we read under covers when it is dark? |
| Publisher | OpenSciEd |
| Author | OpenSciEd Curriculum Development Team |
| Grade Band | Grade 1 (K-2 calibration applied) |
| NGSS Alignment | 1-PS4-2, 1-PS4-3 |
OpenSciEd Elementary Unit 1.1 scores Foundation 0% - at the framework floor. Zero map errors across 30 student-facing passages. Zero confirmed FSEs after rigorous review. But the adjusted gap is 100% - all 20 mechanism passages are UNSCAFFOLDED because the unit contains no atomic, molecular, or even particulate content. This is explicit author intent. The "About the Science" section spells out four deferrals: light as energy → later elementary; speed of light → middle school; reflection's role in seeing objects → 4th grade; refraction/absorption details → not addressed.
The unit faithfully delivers NGSS 1-PS4-2 and 1-PS4-3 - both standards treat light as a phenomenon at the observable level. The verdict is Not Recommended because the WWG framework gives Foundation 0%. The verdict is not a critique of the curriculum's craftsmanship - it's a flag that the standard itself defers atomic content.
Practices score 92.9% green - high . OpenSciEd is a strong inquiry-pedagogy product: anchoring phenomenon, Notice and Wonder charts, Our Growing Ideas charts, student-led collaborative investigation planning, sophisticated modeling sequences, explicit argument-from-evidence sentence starters, equity-centered design. This is a pronounced practices/foundation split: strong inquiry pedagogy + zero atomic anchoring.
The unit is organized around a single anchoring phenomenon: students read a book under three different covers (transparent shower curtain, translucent sheet, opaque blanket) and notice how easy or hard it is to see in each case. This becomes the unit-driving question: How can we read under covers when it is dark?
Lessons 1-2 establish the phenomenon and introduce light sources via a "Light Scavenger Hunt" inside and outside the classroom. Lessons 3-4 investigate materials in the path of a beam of light: students collaboratively plan and conduct an investigation, then sort materials on a Floor Data chart into three categories - transparent (all light through), translucent (some light through), opaque (no light through, creates shadow). Lesson 5 develops drawn models that explain the brightness pattern. Lesson 6 uses pinhole boxes to demonstrate that we need light to see (total darkness → can't see). Lesson 7 introduces reflective materials (mirrors, foil) that redirect light beams. Lessons 8-10 build to a class book that communicates the unit's central explanation: different cover materials let some/none/all light through; we need light to see; we can bring a light source or redirect light to see under covers that block light.
"PS4.B Electromagnetic Radiation: Some materials allow light to pass through them, others allow only some light through, and others block all the light. Mirrors can be used to redirect a light beam. (Boundary: no attempt is made to discuss the speed of light.)" (Unit Overview, p. 13)
The DCI with explicit boundary. Light treated entirely as a macroscopic phenomenon.
"Light as a form of energy: Light is a form of energy. They will begin to develop their understanding of light as a form of energy later in elementary school." (About the Science, p. 31)
Explicit deferral of light-as-energy past Grade 1.
"In 1st grade, students figure out that objects must be illuminated to be seen; however, they will not consider the role of reflection in seeing the object. In 4th grade, students build on this idea." (About the Science, p. 31)
Explicit deferral of reflection's role in seeing to 4th grade.
Materials classified by light transmission: "transparent," "translucent," or "opaque." Vocabulary-based classification with no mechanism for why materials transmit differently. (Lesson 4)
The unit's central macroscopic mechanism. Three-category classification. Correct K-2 physics.
"We need a light source to see an object in darkness. We can see the best when a space is bright and less well when a space is dim. We cannot see in totally dark places because there are no light sources. Total darkness is not common." (Lesson 6)
NGSS 1-PS4-2 delivered. "Total darkness is not common" is sophisticated K-2 work.
"Some materials, like mirrors or foil, cause light beams to change direction (reflect). We can use reflective materials to move light to new places." (Lesson 7)
Reflection as macroscopic phenomenon. The atomic explanation appropriately deferred.
Practices: 92.9% (green tier - high). Six of seven NGSS practices are PRESENT; only mathematics is PARTIAL. The unit is a strong inquiry-pedagogy product: Notice and Wonder chart maintained throughout, multi-stage modeling sequence with self-reflection, students collaboratively plan investigations starting Lesson 3, Floor Data chart for analysis, explicit argument-from-evidence in Lessons 5 and 6 with sentence starters ("I think ___ because my evidence is ___"). Mathematics is PARTIAL (quantitative attributes some/none/all, no formal arithmetic - appropriate for Grade 1). Equity-centered design with diverse scientists in images and texts.
The unit is correctly designed against NGSS 1-PS4. Changing the verdict would require adding atomic content the standard doesn't require.
Option A (lift to Rewrite, ~30-50% Foundation): Add one teacher's note in About the Science AND in Lesson 6 EXPLAIN: "Light is made of tiny pieces called photons. We can't see photons directly, but we can see what they do - they travel from light sources, bounce off mirrors, and stop at opaque materials. Later in school, students will learn that everything around us is made of even tinier pieces called atoms." Single short teacher's note scaffolds the entire unit.
Option B (lift to Conditional, ~60-70%): Build a "What is light made of?" mini-lesson with photon vocabulary plus simple visual analogy.
Option C (push to Recommended, ~80%+): Restructure Lesson 5 modeling to include "tiny pieces of light" in student models. Connect light's behavior to atomic structure of materials.
None are necessary to satisfy NGSS K-2 - but each would close the framework gap the standards leave open.
| Total Passages Scored | 30 |
| 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 20 mechanism passages UNSCAFFOLDED - explicit NGSS-aligned deferral) 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 1.1 is the third type of K-2 atoms-deferred pattern identified, with a new feature: strong practices alongside floor-level Foundation. A pronounced practices/foundation split (92.9% / 0%). OpenSciEd is widely regarded as the gold standard for NGSS-aligned K-12 science curriculum. Its design quality is exceptional. The Not Recommended verdict reflects that the curriculum makes the structural choice that NGSS K-2 standards make - to defer atomic content. It is the framework holding the standard itself accountable, not the curriculum's implementation of the standard.
Exemplary inquiry pedagogy. Anchoring phenomenon. Notice and Wonder chart maintained throughout. Multi-stage modeling sequence (initial → refined → revised with reflection added). Students collaboratively plan investigations starting Lesson 3. Sophisticated argument-from-evidence with sentence starters built into K-1 vocabulary. Equity-centered design with diverse scientists in images and texts. Class Book in Lesson 10 communicates explanations to school community. 92.9% practices score - high in entire WWG programs reviewed.
shallow by default - Zero MISCONCEPTION_BY_DESIGN flags. Light is correctly framed as a phenomenon to be observed (sources, materials, illumination, reflection) at the macroscopic scale. No substance-model energy or REI framings. The "About the Science" section makes the deferrals explicit and pedagogically defensible. Nothing is wrong here - there's just no atomic anchoring anywhere, by author design.
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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