diff --git a/content/geometry/object-classes.adoc b/content/geometry/object-classes.adoc
index 8b280e5f..b82fcbbd 100644
--- a/content/geometry/object-classes.adoc
+++ b/content/geometry/object-classes.adoc
@@ -1,6 +1,22 @@
 = Object classes
 
-* xref:../object-vehicle/vehicle-index.adoc[leveloffset=+3]
-* xref:../object-human/human-index.adoc[leveloffset=+3]
-* xref:../object-environment/environment-index.adoc[leveloffset=+3]
-* xref:../object-other/other-index.adoc[leveloffset=+3]
\ No newline at end of file
+In {THIS_STANDARD}, an object class is a collection of similar objects.
+Examples of object classes are vehicles, humans, and road networks.
+Each instance of an object class is described by the same properties, but has
+individual property values.
+
+The {THIS_STANDARD} standard supports the following object classes:
+
+* xref:../geometry/object-vehicle/vehicle-index.adoc[Vehicle]
+* xref:../geometry/object-human/human-index.adoc[Human]
+* xref:../geometry/object-environment/environment-index.adoc[Environment]
+* xref:../geometry/object-other/other-index.adoc[Other]
+
+If a human is clearly distinguishable from a vehicle, then both the
+human and the vehicle are represented by two different objects respectively. Examples are
+bicycles, motorbikes, or scooters, where the human and the vehicle are
+perceived as separate entities.
+
+The other object class comprises all objects not yet specified by {THIS_STANDARD}.
+It includes all objects that aren't specified by type specific object classes.
+Definitions in type specific object classes overwrite the specifications in the other object class.
\ No newline at end of file
diff --git a/content/geometry/object-introduction.adoc b/content/geometry/object-introduction.adoc
deleted file mode 100644
index 1bc48a98..00000000
--- a/content/geometry/object-introduction.adoc
+++ /dev/null
@@ -1,22 +0,0 @@
-= Introduction
-
-In {THIS_STANDARD}, an object class is a collection of similar objects.
-Examples of object classes are vehicles, humans, and road networks.
-Each instance of an object class is described by the same properties, but has
-individual property values.
-
-The {THIS_STANDARD} standard supports the following object classes:
-
-* xref:../geometry/object-vehicle/vehicle-index.adoc[Vehicle]
-* xref:../geometry/object-human/human-index.adoc[Human]
-* xref:../geometry/object-environment/environment-index.adoc[Environment]
-* xref:../geometry/object-other/other-index.adoc[Other]
-
-If a human is clearly distinguishable from a vehicle, then both the
-human and the vehicle are represented by two different objects respectively. Examples are
-bicycles, motorbikes, or scooters, where the human and the vehicle are
-perceived as separate entities.
-
-The other object class comprises all objects not yet specified by {THIS_STANDARD}.
-It includes all objects that aren't specified by type specific object classes.
-Definitions in type specific object classes overwrite the specifications in the other object class.
\ No newline at end of file
diff --git a/content/nav-openmaterial.adoc b/content/nav-openmaterial.adoc
index 97ff468d..f6911345 100644
--- a/content/nav-openmaterial.adoc
+++ b/content/nav-openmaterial.adoc
@@ -19,7 +19,6 @@ include::use-cases/use-cases.adoc[leveloffset=+1]
 include::geometry/introduction.adoc[leveloffset=+2]
 include::geometry/general.adoc[leveloffset=+2]
 include::geometry/object-classes.adoc[leveloffset=+2]
-include::geometry/object-introduction.adoc[leveloffset=+3]
 include::geometry/object-vehicle/vehicle-index.adoc[leveloffset=+3]
 include::geometry/object-human/human-index.adoc[leveloffset=+3]
 include::geometry/object-environment/environment-index.adoc[leveloffset=+3]