---
type: "sdc-page"
title: "SDC: StructureDefinition-sdc-questionnaire-intro"
source: "sdc/input/pagecontent/StructureDefinition-sdc-questionnaire-intro.xml"
---
# SDC: StructureDefinition-sdc-questionnaire-intro

### Scope and Usage

This profile sets base expectations for use of the [Questionnaire]({{site.data.fhir.path}}questionnaire) resource in all use-cases supported by this implementation guide. It forms foundation for most other Questionnaire profiles within this guide and represents information that is going to be necessary regardless of how the Questionnaire is being used. It identifies which core elements and extensions must be supported and highlights other elements that, while not required, may be relevant to the Questionnaire use-cases.

For systems performing complex package management of Questionnaires, implementers should review the [CRMI Specification](https://hl7.org/fhir/uv/crmi/).