> ## Documentation Index > Fetch the complete documentation index at: https://docs.learningcommons.org/llms.txt > Use this file to discover all available pages before exploring further. # Crosswalks for a standard > Fetches a list of standards that align to a specific standard through shared Learning Components. This endpoint retrieves crosswalk relationships bidirectionally: - **State standard → CCSS**: Pass in a state standard to get matching Common Core State Standards - **CCSS → State standards**: Pass in a CCSS standard to get matching state standards across jurisdictions Each crosswalk includes similarity metrics based on measurable overlap of Learning Components to help understand the strength and nature of the alignment. Crosswalks provide a scalable way to extend mappings between CCSS and state-specific frameworks without independent matching logic. By leveraging the LC superset, crosswalks show where standards converge in content coverage. Use this endpoint when you need to: - Find CCSS standards that align to a state standard for content adaptation - Find state standards that align to a CCSS standard across multiple jurisdictions - Understand the similarity between standards - Map content between Common Core and state frameworks - Analyze the degree of overlap between standards **Note:** Crosswalks are currently available only for Mathematics standards in states where LC alignment exists. Crosswalks are evidence-based (require at least one shared LC). The endpoint returns paginated results. Use the `limit` and `cursor` parameters to control the number of results returned. **Related topics:** - [Standards crosswalks methodology](/knowledge-graph/entity-and-relationship-reference/crosswalks) ## OpenAPI ````yaml /api-reference/knowledge-graph-api/openapi.yaml get /academic-standards/{caseIdentifierUUID}/crosswalks openapi: 3.0.3 info: title: Learning Commons Knowledge Graph REST API description: > REST API for accessing education knowledge graph data including academic standards, learning components, and curriculum information. **Key datasets:** - **Academic standards**: Official state standards from all 50 U.S. states sourced from 1EdTech's CASE Network - **Curriculum**: Structured course content including courses, lesson groupings (units, sections, modules), lessons, activities, and assessments - **Learning components**: Granular, teachable skills that break down broad standards into actionable instructional units - **Relationships**: Hierarchical and semantic connections between standards, learning components, and frameworks **Learn more:** - [Knowledge Graph Overview](/knowledge-graph/understanding-knowledge-graph/about-knowledge-graph) - [Academic Standards Dataset](/knowledge-graph/entity-and-relationship-reference/academic-standards) - [Learning Components Dataset](/knowledge-graph/entity-and-relationship-reference/learning-components) - [Quick Start Guide](/knowledge-graph/getting-started/quickstart) version: '0' servers: - url: https://api.learningcommons.org/knowledge-graph/v0 description: Production server security: - ApiKeyAuth: [] tags: - name: Academic standards description: Academic standards operations - name: Curriculum description: Curriculum and course operations - name: Hierarchy description: Hierarchical navigation operations - name: Learning components description: Learning component operations - name: Learning progressions description: Learning progression and prerequisite relationships - name: Search description: Search and discovery operations - name: Standards crosswalks description: Standards crosswalk operations - name: Standards frameworks description: Standards frameworks operations paths: /academic-standards/{caseIdentifierUUID}/crosswalks: get: tags: - Standards crosswalks - Academic standards summary: Crosswalks for a standard description: > Fetches a list of standards that align to a specific standard through shared Learning Components. This endpoint retrieves crosswalk relationships bidirectionally: - **State standard → CCSS**: Pass in a state standard to get matching Common Core State Standards - **CCSS → State standards**: Pass in a CCSS standard to get matching state standards across jurisdictions Each crosswalk includes similarity metrics based on measurable overlap of Learning Components to help understand the strength and nature of the alignment. Crosswalks provide a scalable way to extend mappings between CCSS and state-specific frameworks without independent matching logic. By leveraging the LC superset, crosswalks show where standards converge in content coverage. Use this endpoint when you need to: - Find CCSS standards that align to a state standard for content adaptation - Find state standards that align to a CCSS standard across multiple jurisdictions - Understand the similarity between standards - Map content between Common Core and state frameworks - Analyze the degree of overlap between standards **Note:** Crosswalks are currently available only for Mathematics standards in states where LC alignment exists. Crosswalks are evidence-based (require at least one shared LC). The endpoint returns paginated results. Use the `limit` and `cursor` parameters to control the number of results returned. **Related topics:** - [Standards crosswalks methodology](/knowledge-graph/entity-and-relationship-reference/crosswalks) operationId: listCrosswalkedStandards parameters: - $ref: '#/components/parameters/CaseIdentifierUUIDPath' - $ref: '#/components/parameters/JurisdictionParam' - name: minJaccardScore in: query required: false description: >- Filter crosswalks by minimum Jaccard similarity score. Only return standards with a Jaccard score greater than or equal to this value. Use this to focus on stronger alignments. schema: type: number format: float minimum: 0 maximum: 1 - $ref: '#/components/parameters/LimitParam' - $ref: '#/components/parameters/CursorParam' responses: '200': description: >- Successfully retrieved list of crosswalked standards. If a state standard is provided, returns matching CCSS standards. If a CCSS standard is provided, returns matching state standards (optionally filtered by jurisdiction). content: application/json: schema: allOf: - $ref: '#/components/schemas/PaginatedResponse' - type: object properties: data: type: array items: $ref: '#/components/schemas/StandardCrosswalk' examples: stateToCommonCore: summary: State standard to CCSS (returns CCSS standards) value: data: - caseIdentifierUUID: 0bb530f0-4b99-11ec-a64d-0242ac1a0003 statementCode: 6.NS.B.4 description: >- Use prime factorization to find the greatest common factor of two whole numbers less than or equal to 100 and the least common multiple of two whole numbers less than or equal to 12. Use the distributive property to express a sum of two whole numbers 1–100 with a common factor as a multiple of a sum of two relatively prime numbers. For example, express 36 + 8 as 4(9 + 2). jurisdiction: Rhode Island jaccard: 1 stateLCCount: 3 ccssLCCount: 3 sharedLCCount: 3 author: 1EdTech provider: Learning Commons license: https://creativecommons.org/licenses/by/4.0/ attributionStatement: >- Knowledge Graph is provided by Learning Commons under the CC BY-4.0 license. Learning Commons received state standards and written permission under CC BY-4.0 from 1EdTech. - caseIdentifierUUID: 16674743-eb8f-11e9-9f9f-0242ac140002 statementCode: 6.NS.B.4 description: >- Find the greatest common factor of two whole numbers less than or equal to 100 and the least common multiple of two whole numbers less than or equal to 12. Use the distributive property to express a sum of two whole numbers 1–100 with a common factor as a multiple of a sum of two whole numbers with no common factor. *For example, express 36 + 8 as 4(9 + 2).* jurisdiction: Colorado jaccard: 1 stateLCCount: 3 ccssLCCount: 3 sharedLCCount: 3 author: 1EdTech provider: Learning Commons license: https://creativecommons.org/licenses/by/4.0/ attributionStatement: >- Knowledge Graph is provided by Learning Commons under the CC BY-4.0 license. Learning Commons received state standards and written permission under CC BY-4.0 from 1EdTech. pagination: limit: 100 nextCursor: null hasMore: false commonCoreToState: summary: CCSS to state standards (returns state standards) value: data: - caseIdentifierUUID: 7cd13b29-605b-3c35-8b10-082008a56b05 statementCode: 3.NF.A.1 description: >- Understand a fraction 1/b as the quantity formed by 1 part when a whole is partitioned into b equal parts jurisdiction: Iowa jaccard: 0.95 stateLCCount: 7 ccssLCCount: 7 sharedLCCount: 7 - caseIdentifierUUID: 8de24c3a-716c-4d46-9c21-193119b67c16 statementCode: MA.3.NF.1 description: >- Understand a fraction 1/b as the quantity formed by 1 part when a whole is partitioned into b equal parts jurisdiction: Massachusetts jaccard: 0.92 stateLCCount: 8 ccssLCCount: 7 sharedLCCount: 7 pagination: limit: 100 nextCursor: >- eyJpZGVudGlmaWVyIjoiOGRlMjRjM2EtNzE2Yy00ZDQ2LTljMjEtMTkzMTE5YjY3YzE2In0= hasMore: true '400': description: Bad request - Invalid CASE UUID or filter parameters content: application/json: schema: $ref: '#/components/schemas/Error' example: error: ValidationError message: Invalid minJaccardScore. Must be a number between 0.0 and 1.0. requestId: req_12345 '404': description: Academic standard not found content: application/json: schema: $ref: '#/components/schemas/Error' example: error: NotFoundError message: >- Academic standard with CASE UUID "6bd8552e-6f8f-4538-bf33-d016ac080178" not found. Verify the UUID is correct. requestId: req_12345 '422': description: >- Unprocessable Entity - Invalid parameter values (e.g., enum value not in allowed list) content: application/json: schema: $ref: '#/components/schemas/Error' example: error: ValidationError message: Input should be 'Alabama', 'Alaska', ..., or 'Multi-State' requestId: req_12345 '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/Error' example: error: InternalServerError message: >- An unexpected error occurred while retrieving crosswalked standards requestId: req_12345 components: parameters: CaseIdentifierUUIDPath: name: caseIdentifierUUID in: path required: true description: The CASE UUID identifier from the CASE Network published by 1EdTech schema: type: string format: uuid JurisdictionParam: name: jurisdiction in: query required: false description: Filter by jurisdiction (state/territory) schema: $ref: '#/components/schemas/JurisdictionENUM' LimitParam: name: limit in: query required: false description: >- Maximum number of results to return. Default is 100. Maximum allowed is 1000. schema: type: integer minimum: 1 maximum: 1000 default: 100 CursorParam: name: cursor in: query required: false description: >- Cursor for pagination. Obtain this value from the 'nextCursor' field in the previous response. Omit for the first page. schema: type: string schemas: PaginatedResponse: type: object description: Generic cursor-based paginated response wrapper required: - data - pagination properties: data: type: array description: Array of result items items: type: object pagination: type: object description: Cursor-based pagination metadata required: - limit - hasMore properties: limit: type: integer description: Maximum number of results returned per page nextCursor: type: string nullable: true description: >- Cursor for fetching the next page. Null if no more results available. Pass this value as the 'cursor' parameter in the next request. hasMore: type: boolean description: >- Indicates whether there are more results available after this page StandardCrosswalk: type: object description: > Represents a crosswalk relationship between two standards, including similarity metrics based on shared Learning Components. Crosswalks connect mathematics standards bidirectionally based on measurable overlap of Learning Components: - **State → CCSS**: When querying with a state standard, this represents an aligned CCSS standard - **CCSS → State**: When querying with a CCSS standard, this represents an aligned state standard Each crosswalk includes quantitative measures that help understand the strength and nature of the alignment. The Jaccard similarity score measures the proportion of shared Learning Components between the two standards, with scores ranging from 0 (no overlap) to 1 (complete overlap). Higher scores indicate stronger similarity in content coverage. required: - caseIdentifierUUID - author - provider - license - attributionStatement properties: caseIdentifierUUID: type: string format: uuid description: >- The CASE UUID of the aligned standard. Use this identifier to retrieve the full standard details via GET /academic-standards/{caseIdentifierUUID}. statementCode: type: string nullable: true description: >- The statement code of the aligned standard (e.g., "3.NF.A.1" for CCSS, "MA.3.NF.1" for Massachusetts). May be null for organizational groupings. description: type: string nullable: true description: >- The full text of the aligned standard describing what students should know or be able to do jurisdiction: type: string nullable: true description: >- The jurisdiction of the aligned standard. For CCSS standards, this is "Multi-State". For state standards, this is the state name (e.g., "Iowa", "Massachusetts"). jaccard: type: number format: float description: >- The Jaccard similarity score representing the proportion of shared Learning Components between the state standard and CCSS standard. Values range from greater than 0 to 1, where 1 indicates complete overlap and values closer to 0 indicate minimal overlap. Calculated as sharedLCCount / (stateLCCount + ccssLCCount - sharedLCCount). minimum: 0 maximum: 1 stateLCCount: type: integer description: The number of Learning Components that support the state standard minimum: 0 ccssLCCount: type: integer description: The number of Learning Components that support the CCSS standard minimum: 0 sharedLCCount: type: integer description: >- The number of Learning Components shared by both the state standard and the CCSS standard. This is the evidence basis for the crosswalk relationship. minimum: 1 author: type: string description: >- The author or creator of this content, typically the organization that published the standards framework provider: type: string description: >- The service provider or organization that makes this data available in the knowledge graph license: type: string format: uri description: A URL to the license document that applies to this content attributionStatement: type: string description: >- A textual credit that acknowledges the source and creator of this work, as required by the CC BY 4.0 license. If you display or redistribute this standard, you must include this attribution statement to comply with the license terms. Error: type: object description: Standard error response object returned for all error conditions required: - error - message - requestId properties: error: type: string description: >- A machine-readable error type identifier (e.g., ValidationError, NotFoundError, InternalServerError) message: type: string description: >- A human-readable error message that explains what went wrong and may include actionable guidance requestId: type: string description: >- A unique identifier for this request, useful for debugging and support details: type: object description: >- Optional additional details about the error, such as validation failures or field-specific issues additionalProperties: true JurisdictionENUM: type: string description: US state, territory, or multi-state designation enum: - Alabama - Alaska - Arizona - Arkansas - California - Colorado - Connecticut - Delaware - Florida - Georgia - Hawaii - Idaho - Illinois - Indiana - Iowa - Kansas - Kentucky - Louisiana - Maine - Maryland - Massachusetts - Michigan - Minnesota - Mississippi - Missouri - Montana - Nebraska - Nevada - New Hampshire - New Jersey - New Mexico - New York - North Carolina - North Dakota - Ohio - Oklahoma - Oregon - Pennsylvania - Rhode Island - South Carolina - South Dakota - Tennessee - Texas - Utah - Vermont - Virginia - Washington - Washington, D.C. - West Virginia - Wisconsin - Wyoming - Multi-State securitySchemes: ApiKeyAuth: type: apiKey in: header name: x-api-key description: >- API key for authentication. Include your API key in the x-api-key header for all requests. ````