# Ontario Grade 2 Science and Technology — 9 November 2026

This dependent proposal reviews all **52 retained Grade 2 codes: 41 specific and
11 overall expectations**, using existing topics. It builds on the unmerged
[Grade 1 proposal, PR #93](https://github.com/withmarbleapp/os-taxonomy/pull/93),
including its lead-reviewed whole-claim age deferral, conservative component reuse
and documentation fixes.
The exact dependency commit is recorded in the
[code-by-code mapping](ontario-grade2-science-mapping-2026-11-09.json).
That proposal is not represented here as accepted main or a deployment receipt.

## Outcome

| Reviewed scope | Full semantic support | Partial | New topics proposed |
| --- | ---: | ---: | ---: |
| 41 specific expectations | 13 | 28 | 0 |
| 11 overall expectations | 0 | 11 | 0 |

The proposal adds **68 distinct topic–code pairs across 35 specific codes and
47 existing topics**. It adds **47 scoped records**, each Canada/Ontario ages
**7–8**, while preserving all existing intervals and links. It does not broaden,
narrow or merge any mastery claim, edit assessments, change dependencies, or
introduce difficulty levels. Generated global start ages are not lowered.

Full is a semantic authoring judgment about available claim support, not learner
mastery or proof of delivered teaching. Partial records retain concrete conditions
and candidates; they are not instructions to add topics. The six specific codes
without a proposed direct association still have reviewed dispositions. Overall
codes are reviewed independently and reference their children without automatic
Full rollups or extra direct links.

## Source and evidence

Read the complete four-page [Ministry Grade 2 expectations PDF](https://assets-us-01.kc-usercontent.com/fbd574c4-da36-0066-a0c5-849ffb2de96e/e9fdecb3-6ea2-4953-b69b-20ea519313af/SciTech_G2_AODA.pdf),
retrieved 9 November 2026, SHA-256
`232598857d638b5938c4053892ee359da58185a4e7e16d3ed5f5fa934b04f538`.
The [full 2022 curriculum](https://assets-us-01.kc-usercontent.com/fbd574c4-da36-0066-a0c5-849ffb2de96e/36038265-bd6d-4991-882b-52b4b06c32d0/The%20Ontario%20Curriculum%20Grades%201%E2%80%938%20%E2%80%93%20Science%20and%20Technology%202022_2.pdf),
SHA-256 `1ade9235dcacf15c27dcc92328d1f883c3026c1687bf40368448b39ec6e4bd74`,
provides process context on printed pages 69–80 and the Grade 2 section on
printed pages 102–112.

Independent text readback matches all 41 specific paragraphs between those two
official PDFs. A vertical copyright notice on standalone page 4 enters the text
stream between expectation rows; it was visually checked and removed as a known
footer for that comparison. No expectation content was normalized away.

The public artifacts contain codes, Marble claim descriptions and review
judgments rather than restricted expectation wording. Review examines each
requirement's parts, the complete existing claim/evidence/assessment, and hard
prerequisites. Searches span subjects and domains rather than only the source's
learning-area labels. The official flexible process guidance is retained;
advanced research or engineering steps are not invented as universal Grade 2
requirements.

## Reuse decisions that avoid unnecessary additions

- **A2.1:** **Planning a Task** (`mt_QR3vxbN1o4`) already assesses breaking a
  larger task into ordered steps. It combines with existing algorithms and first
  programs; another decomposition topic is unnecessary. The actual science
  investigation/model remains an explicit performance condition.
- **C2.6:** **Classifying Materials** (`mt_zHnOGwHIEz`) already plans property
  tests, records results and groups materials, with floating as an assessment
  example. **Describing Material Properties** (`mt_auVZZEuXjs`) includes
  absorbency/waterproofness. This supports the required classifications without
  inventing a buoyant-force theory claim.
- **C2.7:** **Health and safety signs** (`mt_DRNXFr0ds6`) is in Personal and
  Social Development, but explicitly includes household poison/hazard symbols.
  Reuse it. Explaining multiple actual substance-symbol meanings still needs a
  checked resource and assessment; a generic request to tell an adult is not Full.
- **E1.1–E1.2:** environmental responses, viewpoint comparison and task planning
  exist already. Keep the local/household application and verified community
  resources explicit rather than creating another planning or national-context
  topic. Australian Country-specific evidence is not relabelled as Canadian.
- **B2.5:** the camouflage claim already supplies multiple functional physical
  adaptation examples. The source permits physical and/or behavioural cases;
  neither later evolutionary theory nor an additional behaviour topic is imposed.

## Conditions and candidate review

The mapping records all remaining conditions. Important distinctions include:

- **Life histories:** current cycle and growth claims contribute, but a minimum
  two-organism example does not certify the complete required group set or
  appearance-and-behaviour comparisons through full cases. Improve the source-fit
  assessment sample before assuming a missing topic.
- **Household substances and mixtures:** generic safety or food preparation
  contributes only where its actual operation matches. Storage/disposal effects,
  useful liquid/solid combinations and non-transition cases need explicit tasks.
  The later solution/recovery candidate is not lowered to match one easier clause;
  its mixture/solution wording also warrants a separate factual review.
- **Mechanisms:** lever/pulley knowledge and ramp examples are present, but the
  complete named category/use set and varied with/without force comparisons are
  not established. This is not approval for a new collection of machine topics.
  The later mechanism and force-vocabulary claims retain their whole meanings and
  ages; no 7–8 context is manufactured from one matching term.
- **Water:** physical distribution, environmental importance and fairness can
  support future work but are not a complete account of community access to
  drinking water. Do not equate freshwater volume with drinking-water availability.
  Air/water-property completeness, actual built-water cases and the required
  locally grounded plans remain explicit. Normal resource/task work may resolve
  conditions without changing the taxonomy.

## Code-by-code overview

`C` means direct component and `W` whole-expectation contribution. The JSON mapping
contains rationales, conditions, deferred candidate IDs and prerequisite-only
references. A blank direct holder is not a new-topic requirement.

| Code | Semantic judgment | Direct topic IDs and roles |
| --- | --- | --- |
| A1 | Partial | Child reviews |
| A1.1 | Partial | `mt_XirhnAB6Ye` (C); `mt_4A4RpX-Go9` (C); `mt_vJO5Bxk4z-` (C); `mt_7VrR1GzhrN` (C) |
| A1.2 | Partial | `mt_XirhnAB6Ye` (C); `mt_MRQcEvyPJv` (C); `mt_Wa44s-f8Ws` (C); `mt_ZFwPZaDJ0_` (C); `mt_7VrR1GzhrN` (C) |
| A1.3 | Partial | `mt_hi8cVycbwn` (C); `mt_FtCLISvSGw` (C); `mt_RlILL2sccX` (C); `mt_nNYo5A-7Bl` (C) |
| A1.4 | Partial | `mt_TTH2ouwyTW` (C); `mt_FtCLISvSGw` (C) |
| A1.5 | Partial | `mt_7VrR1GzhrN` (C); `mt_o8ciHks8t2` (C); `mt_NP101Zl-4g` (C) |
| A2 | Partial | Child reviews |
| A2.1 | Partial | `mt_QR3vxbN1o4` (C); `mt__p5n8z5soJ` (C); `mt_sPV503BQnI` (C) |
| A2.2 | Partial | `mt_AzTrT5ySCx` (C) |
| A3 | Partial | Child reviews |
| A3.1 | Full | `mt_Q2Zj3L8u9C` (C); `mt_rTn43s8RNX` (C) |
| A3.2 | Partial | `mt_RlILL2sccX` (C); `mt_4A4RpX-Go9` (C) |
| A3.3 | Partial | — |
| B1 | Partial | Child reviews |
| B1.1 | Partial | `mt_qixeaiswFP` (C); `mt_SZJ1mN7Vfk` (C) |
| B1.2 | Full | `mt_deexfCHU9m` (W) |
| B2 | Partial | Child reviews |
| B2.1 | Partial | `mt_fDoE-pL6Jv` (C); `mt_oR6dwRj2Ll` (C) |
| B2.2 | Full | `mt__7hXSTbu9s` (W) |
| B2.3 | Partial | `mt_4IVWRAZoNC` (C); `mt_oR6dwRj2Ll` (C) |
| B2.4 | Partial | `mt_4IVWRAZoNC` (C); `mt_hsN-YvCNQY` (C) |
| B2.5 | Full | `mt_pwo81ls_J-` (W) |
| C1 | Partial | Child reviews |
| C1.1 | Partial | `mt_EWiY8-opdd` (C); `mt_TTH2ouwyTW` (C) |
| C1.2 | Partial | — |
| C2 | Partial | Child reviews |
| C2.1 | Full | `mt_1JFUNQDwAJ` (W) |
| C2.2 | Full | `mt_1JFUNQDwAJ` (W) |
| C2.3 | Full | `mt_1JFUNQDwAJ` (C); `mt_Pl-nsjYGZ3` (C) |
| C2.4 | Partial | `mt_Pl-nsjYGZ3` (C) |
| C2.5 | Partial | `mt_F62VTeHB4-` (C); `mt_ahSqW_kK1b` (C) |
| C2.6 | Full | `mt_zHnOGwHIEz` (C); `mt_auVZZEuXjs` (C) |
| C2.7 | Partial | `mt_DRNXFr0ds6` (C) |
| D1 | Partial | Child reviews |
| D1.1 | Partial | `mt_MVlTa0XKgo` (C) |
| D1.2 | Partial | — |
| D2 | Partial | Child reviews |
| D2.1 | Full | `mt_Dg5lQZFpav` (W) |
| D2.2 | Full | `mt_B3W5EfimJw` (W) |
| D2.3 | Partial | — |
| D2.4 | Partial | — |
| D2.5 | Partial | `mt_B3W5EfimJw` (C) |
| E1 | Partial | Child reviews |
| E1.1 | Partial | `mt_deexfCHU9m` (C); `mt_2GDBmKCJxs` (C); `mt_QR3vxbN1o4` (C) |
| E1.2 | Partial | `mt_deexfCHU9m` (C); `mt_QR3vxbN1o4` (C) |
| E1.3 | Partial | — |
| E2 | Partial | Child reviews |
| E2.1 | Partial | `mt_1JFUNQDwAJ` (C); `mt_j7cj9eWN7w` (C) |
| E2.2 | Partial | `mt_nRF_VRntrW` (C) |
| E2.3 | Full | `mt_fhqVdj4BYr` (C); `mt_zCGwH1OQZa` (C) |
| E2.4 | Full | `mt_1JFUNQDwAJ` (C); `mt_Pl-nsjYGZ3` (C); `mt_fhqVdj4BYr` (C) |
| E2.5 | Full | `mt_L1469gt34A` (C); `mt_tiPyEkm4cU` (C) |

## Separate assessment-quality correction

The existing **States of Matter Vocabulary** (`mt_1JFUNQDwAJ`) prompt uses an
ambiguous kettle-steam example. Its classification claim remains useful, but
visible white mist must not be presented as gas. The proposed clarification is:

> If you point to water in a cup, an ice cube, and air inside an inflated balloon,
> can {{name}} correctly call each one a liquid, solid, or gas — and use those
> words naturally?

This retains the same three-state classification demand with a concrete gas
example. It is a proposed narrow correction, **not an authored topic change in
this alignment batch**. The mapping records the quality issue wherever this
holder contributes. It does not require another mastery topic or difficulty tier.

## Context readiness and verification

The mapping identifies **26 distinct hard-prerequisite IDs** without
an explicit Ontario context spanning the complete 7–8 interval. This is a narrow
public-context diagnostic, not a consumer eligibility algorithm or a certificate
of selectable coverage. Existing global/framework guidance and consumer rules
need separate consideration. Prerequisite-only support is not silently converted
into a source link, and no age-only record or edge is invented to clear the list.

Public validation, generated-artifact checks and all 94 regression tests pass. Exact readback reconciles
all selected codes and proposed pairs, preserves complete unaffected contexts,
and confirms no global start-age lowering. All authored topic fields, research,
dependencies, catalogue, clusters, archives and Grade 1 reports remain unchanged
relative to the documented dependency. No DB or learner writes occurred.

This branch depends on the Grade 1 proposal; reconcile it with the accepted base
before ordinary PR handoff. Remaining conditions are explicit work, not a claim
that Grade 2 Science or Ontario alignment is finished.