diff --git a/docs/hooks/questionnaire-inprogress.md b/docs/hooks/questionnaire-inprogress.md
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@@ -0,0 +1,123 @@
+# `questionnaire-inprogress`
+
+!!! info
+    This page defines a workflow [hook](../../specification/current/#hooks) for the purpose of providing clinical decision support using CDS Hooks. This is a **build** at the level of **[Draft](http://hl7.org/fhir/versions.html#std-processs)**
+
+| Metadata | Value |
+| ---- | ----
+| specificationVersion | 1.0
+| hookVersion | 1.0
+| hookMaturity | [0 - Draft](../../specification/current/#hook-maturity-model)
+
+## Workflow
+
+This hook is invoked whenever a user is in the progress of answering a questionnaire.
+It may be invoked continuously during answering a questionnaire, at the start, or after finishing it.
+The hook provides feedback on the content of the filled questionnaire, represented as a 
+`QuestionnaireResponse`. The `QuestionnaireResponse` within the `context.questionnaireReponse` MUST be a valid 
+FHIR Resource, but can be regarded as transient data and only MAY be stored in a FHIR server already.
+Given the high number and variability of Questionnaires, the hook is defined sparsely to offer implementers freedom for
+their respective use-case. A loose collection of possible workflows are:
+- Interactive information for helping in filling out / completing the form
+- Offering potential caretakers, including appointments, in the area of a patient for provided symptoms
+- Showing medical personnel relevant differential diagnoses given a set of answers
+- Offering order sets when finishing an admission form
+- Offering adding entered information as structured Observations to a patients EHR
+
+## Context
+
+The current response data of the questionnaire in progress, as well as the identifiers for the current encounter if fitting.
+
+Field | Optionality | Prefetch Token | Type     | Description
+----- | -------- | ---- |----------| ----
+`questionnaireResponse` | REQUIRED | Yes | *object* | A single [QuestionnaireResponse](https://www.hl7.org/fhir/questionnaireresponse.html) resource
+`userId` | OPTIONAL | Yes | *string* | The id of the current user.<br />For this hook, the user could be of type [Practitioner](https://www.hl7.org/fhir/practitioner.html), [PractitionerRole](https://www.hl7.org/fhir/practitionerrole.html), [Patient](https://www.hl7.org/fhir/patient.html), or [RelatedPerson](https://www.hl7.org/fhir/relatedperson.html).<br />For example, `Practitioner/123`
+`patientId` | OPTIONAL | Yes | *string* | The FHIR `Patient.id` of the current patient in context
+`encounterId` | OPTIONAL | Yes | *string* | The FHIR `Encounter.id` of the current encounter in context
+
+
+### Examples
+
+
+```json
+"context": {
+  "questionnaireResponse" :
+    {
+    "resourceType": "QuestionnaireResponse",
+    "id": "gcs",
+    "questionnaire": "http://hl7.org/fhir/Questionnaire/gcs",
+    "status": "completed",
+    "subject": {
+        "reference": "Patient/example",
+        "display": "Peter James Chalmers"
+    },
+    "authored": "2014-12-11T04:44:16Z",
+    "source": {
+      "reference": "Practitioner/f007"
+    },
+    "item": [
+        {
+            "linkId": "1.1",
+            "answer": [
+                {
+                "valueCoding": {
+                    "extension": [
+                        {
+                            "url": "http://hl7.org/fhir/StructureDefinition/ordinalValue",
+                            "valueDecimal": 4
+                        }
+                    ],
+                    "system": "http://loinc.org",
+                    "code": "LA6560-2",
+                    "display": "Confused"
+                    }
+                }
+            ]
+        },
+        {
+            "linkId": "1.2",
+            "answer": [
+                {
+                "valueCoding": {
+                    "extension": [
+                        {
+                            "url": "http://hl7.org/fhir/StructureDefinition/ordinalValue",
+                            "valueDecimal": 5
+                        }
+                    ],
+                    "system": "http://loinc.org",
+                    "code": "LA6566-9",
+                    "display": "Localizing pain"
+                    }
+                }
+            ]
+        },
+        {
+            "linkId": "1.3",
+            "answer": [
+                {
+                "valueCoding": {
+                    "extension": [
+                        {
+                            "url": "http://hl7.org/fhir/StructureDefinition/ordinalValue",
+                            "valueDecimal": 4
+                        }
+                    ],
+                    "system": "http://loinc.org",
+                    "code": "LA6556-0",
+                    "display": "Eyes open spontaneously"
+                    }
+                }
+            ]
+        }
+    ]
+  }
+}
+```
+
+
+## Change Log
+
+Version | Description
+---- | ----
+1.0 | Initial Release
diff --git a/mkdocs.yml b/mkdocs.yml
index 21a45aa8..24f6cd9d 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -26,6 +26,7 @@ nav:
     - 'appointment-book 1' : 'hooks/appointment-book.md'
     - 'encounter-start 1' : 'hooks/encounter-start.md'
     - 'encounter-discharge 1' : 'hooks/encounter-discharge.md'
+    - 'questionnaire-inprogress 0' : 'hooks/questionnaire-inprogress.md'
 - Quick Start: 'quickstart.md'
 - Cheat Sheet: 'cheat-sheet/Cheat Sheet - Sept 2019.pdf'
 - Best Practices: 'best-practices.md'