diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6a38d9155..7658231fb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,6 +36,7 @@ and the versioning aims to respect [Semantic Versioning](http://semver.org/spec/
 - uncertainty of a model, nature of uncertainty, level of uncertainty, location of uncertainty role, ambiguous uncertainty, epistemological uncertainty, ontological uncertainty, shallow uncertainty, medium uncertainty, deep uncertainty, recognised ignorance, has uncertainty nature, has uncertainty location, has uncertainty level (#1945)
 - feasible potential determination process, techno-economic potential determination process, wind characteristics determination process, wind farm area determination process, wind potential determination process (#1940, #1966)
 - feasible potential determination method, techno-economic potential determination method, wind characteristics determination method, wind farm area determination method, wind potential determination method (#1940, #1966)
+- technical model implementation(#1978)
 - model system boundary (#1977)
 
 ### Changed
diff --git a/src/ontology/edits/oeo-model.omn b/src/ontology/edits/oeo-model.omn
index bd9696b4c..daa5ef622 100644
--- a/src/ontology/edits/oeo-model.omn
+++ b/src/ontology/edits/oeo-model.omn
@@ -3811,6 +3811,16 @@ pull request: https://github.com/OpenEnergyPlatform/ontology/pull/1945",
         <http://purl.obolibrary.org/obo/BFO_0000023>
     
     
+Class: OEO_00400042
+
+    Annotations: 
+        <http://purl.obolibrary.org/obo/IAO_0000115> "A technical model implementation is a generically dependent continuant that is part of a model and consists of the hardware and software realization of a (conceptual) model.",
+        <http://purl.obolibrary.org/obo/IAO_0000118> "model code",
+        <http://purl.obolibrary.org/obo/IAO_0000119> "https://www.researchgate.net/publication/264816512_Classifying_and_communicating_uncertainties_in_model-based_policy_analysis",
+        <http://purl.obolibrary.org/obo/IAO_0000233> "issue: https://github.com/OpenEnergyPlatform/ontology/issues/1953
+pull request: https://github.com/OpenEnergyPlatform/ontology/pull/1978",
+        rdfs:label "technical model implementation"@en
+
 Class: OEO_00400041
 
     Annotations: 
@@ -3819,6 +3829,7 @@ Class: OEO_00400041
         <http://purl.obolibrary.org/obo/IAO_0000233> "issue: https://github.com/OpenEnergyPlatform/ontology/issues/1951
 pull request: https://github.com/OpenEnergyPlatform/ontology/pull/1977",
         rdfs:label "model system boundary"@en
+
     
     SubClassOf: 
         <http://purl.obolibrary.org/obo/BFO_0000031>,