Standards Crosswalks

Schema last updated September 23, 2025.

Overview

Standards Crosswalks connect state mathematics standards to their closest matching Common Core State Standards: Mathematics (CCSSM) based on measurable overlap of Learning Components. Direction is always state → CCSS (not state → state).

Relationships

Understanding the Jaccard index

A Jaccard index measures the level of similarity between 2 sets. It is scored on a scale of 0.0 to 1.0 – 0.0 represents zero overlap and 1.0 represents complete overlap. In the context of the Knowledge Graph, we use the Jaccard index to measure how similar a state standard’s Learning Components are to a Common Core State Standard’s Learning Components: Jaccard index = Shared Learning Components / Total unique Learning Components

Example: If a state standard has 5 Learning Components, a CCSSM standard has 6, and they share 4 of them, their Jaccard index would be 4 / (5 + 6 − 4) = 0.57i.e., about 57% of these standards’ underlying skills overlap

Only standards with at least one shared Learning Component have a Jaccard index.

`hasStandardAlignment`

Source node	Target node
`StandardsFrameworkItem` (state standard)	`StandardsFrameworkItem` (CCSS standard)

Relationship property	Description
`dateCreated`	Date on which the element was created.
`license`	License document that applies to this content, typically indicated by URL.
`targetEntity`	Type of entity to which the relationship points; specifies the class or category of the ending node in the connection.
`attributionStatement`	Textual credit that acknowledges the source or creator of a work, included when required by the content’s license (e.g., Creative Commons BY).
`description`	A hasStandardAlignment relationship connects a State standard to a CCSS standard when the two are supported by overlapping sets of Learning Components. The relationship indicates an evidence-based crosswalk derived from measurable overlap of deconstructed skills, expressed through properties such as jaccard and LC counts. It does not imply sequence, dependency, or pedagogical progression, only the degree of shared content between the two standards.
`dateModified`	Date on which the element was most recently modified.
`identifier`	Identifier of the item, either as textual strings or as URL (URI) links.
`stateLCCount`	Number of Learning Components supporting the state standard.
`provider`	Service provider, service operator, or service performer.
`sourceEntity`	Type of entity from which the relationship originates; specifies the class or category of the starting node in the connection.
`sharedLCCount`	Number of Learning Components shared by both standards.
`sourceEntityKey`	Name of the property within the source entity that contains its unique identifier; used to locate and reference the entity in the dataset.
`ccssLCCount`	Number of Learning Components supporting the CCSS standard.
`author`	Author of this content.
`jaccard`	Proportion of shared LCs between state and CCSS standards (0 < jaccard ≤ 1).
`targetEntityKey`	Name of the property within the target entity that contains its unique identifier; used to locate and reference the entity in the dataset.
`relationshipType`	Normalized value that defines the semantic meaning of the connection between the source and target entities (`hasStandardAlignment`).

example.json

{
  "type": "relationship",
  "identifier": "3edc451c-392b-50ad-addd-d6b76ab7ab49",
  "label": "hasStandardAlignment",
  "properties": {
    "dateCreated": "2026-01-02",
    "license": "https://creativecommons.org/licenses/by/4.0/",
    "targetEntity": "StandardsFrameworkItem",
    "attributionStatement": "Knowledge Graph is provided by Learning Commons under the CC BY-4.0 license.",
    "description": "A hasStandardAlignment relationship connects a State standard to a CCSS standard when the two are supported by overlapping sets of Learning Components. The relationship indicates an evidence-based crosswalk derived from measurable overlap of deconstructed skills, expressed through properties such as jaccard and LC counts. It does not imply sequence, dependency, or pedagogical progression, only the degree of shared content between the two standards.",
    "dateModified": "2026-01-02",
    "identifier": "3edc451c-392b-50ad-addd-d6b76ab7ab49",
    "stateLCCount": "2",
    "provider": "Learning Commons",
    "sourceEntity": "StandardsFrameworkItem",
    "sharedLCCount": "2",
    "sourceEntityKey": "caseIdentifierUUID",
    "ccssLCCount": "2",
    "author": "Learning Commons",
    "jaccard": "1.0",
    "targetEntityKey": "caseIdentifierUUID",
    "relationshipType": "hasStandardAlignment"
  },
  "source_identifier": "20d6435a-4b7f-53b7-abcc-cb61dcd36679",
  "source_labels": ["StandardsFrameworkItem"],
  "target_identifier": "74721dc3-d49c-5f16-804c-4cb07fca6ed6",
  "target_labels": ["StandardsFrameworkItem"]
}

Standards Crosswalks

Schema release history

Date	Changed
September 23, 2025	First release.