diff --git a/domains/disinformation/crud-actions/README.md b/domains/disinformation/crud-actions/README.md
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+# CRUD Actions
+
+## Description
+
+Most basic Web interfaces follow the Create/Replace/Update/Delete pattern to manipulate resources. A forum, for instance, may expose actions to create or edit (replace) a post, to create a response to a post or even to create or delete a new discussion space dedicated to a particular topic.
+
+## Competency Questions
+
+| ID | Question in natural language | Example of answer |
+|---|---|---|
+| q1_1 | What request to send to post a message? | POST /topics/random/posts |
+| q1_2 | What request to send to respond to a post? | POST /topics/random/posts/123/answers |
+| q2 | What request to send to edit a post? | PUT /topics/random/posts/123 |
+| q3 | What request to send to delete a peviously posted message? | DELETE /topics/random/posts/123 |
+| q4 | What request to send to add a user to some forum? | POST /topics/random |
+
+Editing a post may either be executed as a single update operation, as a replace operation or as a sequence of delete and create operations. In case the three options have different side effects, an agent should be informed of the side effects of each action.
+
+## Glossary
+
+* [**CreateAction**](https://purl.org/hmas/CreateAction): Action to create a new resource.
+* [**ReplaceAction**](https://purl.org/hmas/ReplaceAction): Action to replace an existing resource.
+* [**UpdateAction**](https://purl.org/hmas/UpdateAction): Action to update the representation of an existing resource by adding statements to it.
+* [**DeleteAction**](https://purl.org/hmas/DeleteAction): Action to delete an existing resource.
+
+### Recommendations
+
+- On-going actions can be described as temporal entities with the [PROV-O](https://www.w3.org/TR/prov-o/) and [OWL Time](https://www.w3.org/TR/owl-time/) ontologies. Action specification can be given as SHACL shapes on `prov:Activity` instances.
+- [DublinCore terms](http://purl.org/dc/terms/) can capture the fact that a resource has a new version after every action.
diff --git a/domains/disinformation/crud-actions/dataset.ttl b/domains/disinformation/crud-actions/dataset.ttl
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+@prefix : <https://purl.org/hmas/> .
+@prefix ex: <https://example.org/> .
+@prefix owl: <http://www.w3.org/2002/07/owl#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix time: <http://www.w3.org/2006/time#> .
+@prefix prov: <http://www.w3.org/ns/prov#> .
+@prefix dct: <http://purl.org/dc/terms/> .
+@prefix sioc: <http://rdfs.org/sioc/ns#> .
+@prefix sh: <http://www.w3.org/ns/shacl#> .
+
+ex:CreatePostAction
+    a sh:NodeShape, owl:Class ;
+    rdfs:subClassof :CreateAction ;
+    sh:property [
+        sh:path [ sh:inversePath prov:wasGeneratedBy ] ;
+        sh:class sioc:Post
+    ] .
+
+ex:CreateAnswerAction
+    a sh:NodeShape, owl:Class ;
+    rdfs:subClassof :CreateAction ;
+    sh:property [
+        sh:path [ sh:inversePath prov:wasGeneratedBy ] ;
+        sh:and (
+            [
+                sh:classs sioc:Post
+            ]
+            [
+                sh:property [
+                    sh:path [ sh:inversePath sioc:has_reply ] ;
+                    sh:minCount 1
+                ]
+            ]
+        )
+    ] .
+
+ex:DeleteForumAction
+    a sh:NodeShape, owl:Class ;
+    rdfs:subClassof :DeleteAction ;
+    sh:property [
+        sh:path prov:used ;
+        sh:class sioc:Forum
+    ] .
diff --git a/domains/disinformation/crud-actions/onto.ttl b/domains/disinformation/crud-actions/onto.ttl
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+@prefix : <https://purl.org/hmas/> .
+@prefix owl: <http://www.w3.org/2002/07/owl#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix time: <http://www.w3.org/2006/time#> .
+@prefix prov: <http://www.w3.org/ns/prov#> .
+@prefix dct: <http://purl.org/dc/terms/> .
+@prefix sioc: <http://rdfs.org/sioc/ns#> .
+@prefix sh: <http://www.w3.org/ns/shacl#> .
+
+:interaction a owl:Ontology .
+
+# TODO should prov:used statements be specialized to better capture actions?
+
+:CreateAction
+    a sh:NodeShape, owl:Class ;
+    sh:property [
+        sh:path [ sh:inversePath prov:wasGeneratedBy ] ;
+        sh:node [
+            sh:property [
+                sh:path [ sh:inversePath dct:isReplacedBy ] ;
+                sh:maxCount 0
+            ]
+        ]
+    ] ;
+    rdfs:isDefinedBy :interaction .
+
+:ReplaceAction
+    a sh:NodeShape, owl:Class ;
+	sh:property [
+		sh:path ( [ sh:inversePath prov:wasGeneratedBy ] dct:isReplacedBy ) ;
+		sh:equals prov:used
+	] ;
+    rdfs:isDefinedBy :interaction .
+
+# TODO UpdateAction (to POST new triples to an existing resource)
+
+:DeleteAction
+    a sh:NodeShape, owl:Class ;
+    sh:property [
+        sh:path prov:used ;
+        sh:node [
+              sh:property [
+                  sh:path dct:isReplacedBy ;
+                  sh:maxCount 0
+              ]
+        ]
+    ] ;
+    rdfs:isDefinedBy :interaction .
+
+:initiated
+    a owl:ObjectProperty ;
+    rdfs:comment "The form submitted to a server initiates activity (performed on the server) that transforms resources" ;
+    rdfs:domain hctl:Form ;
+    rdfs:range prov:Activity .
+
+# TODO improve relationship between signifiers/forms and actions
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