> For the complete documentation index, see [llms.txt](https://docs.formsort.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.formsort.com/response-data-collection-and-management.md).

# Response Data Collection & Management

- [Schema (variables)](https://docs.formsort.com/response-data-collection-and-management/variable-schema.md): Use and classify answers and other data once it has been collected.
- [Variables from questions](https://docs.formsort.com/response-data-collection-and-management/variable-schema/variables-from-questions.md)
- [Externally provided variables](https://docs.formsort.com/response-data-collection-and-management/variable-schema/external-answers.md): Capture values passed into flows, even if not collected in questions (also known as hidden fields).
- [Calculated variables](https://docs.formsort.com/response-data-collection-and-management/variable-schema/calculated-answers.md): Create derived variables by writing functions optionally using other variables
- [API lookups](https://docs.formsort.com/response-data-collection-and-management/variable-schema/api-answers.md): Store answers from API calls.
- [System Library variables](https://docs.formsort.com/response-data-collection-and-management/variable-schema/system-library-answers.md): Built-in answers about the responder's context and state.
- [Orphaned variables](https://docs.formsort.com/response-data-collection-and-management/variable-schema/orphaned-answers.md): A home for all your unresolved variable dependencies.


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