diff --git a/src/AasxPluginProductChangeNotifications/PcnAnyUiControl.cs b/src/AasxPluginProductChangeNotifications/PcnAnyUiControl.cs
index c6222c86..2cea22eb 100644
--- a/src/AasxPluginProductChangeNotifications/PcnAnyUiControl.cs
+++ b/src/AasxPluginProductChangeNotifications/PcnAnyUiControl.cs
@@ -26,6 +26,7 @@ This source code may use other Open Source software components (see LICENSE.txt)
 using System.Globalization;
 using System.Windows.Controls;
 using AasxIntegrationBaseGdi;
+using System.Windows;
 
 namespace AasxPluginProductChangeNotifications
 {
@@ -374,6 +375,51 @@ protected void InnerDocAddText(
                 wrap: (wrapText != AnyUiTextWrapping.Wrap) ? null : (new[] { 1 }));
         }
 
+        protected void InnerDocAddGridCells(
+            AnyUiSmallWidgetToolkit uitk,
+            AnyUiGrid grid,
+            string[] cell,
+            int[] bold = null,
+            int[] wrap = null,
+            int[] centered = null)
+        {
+            // access and add row
+            if (grid == null || cell == null)
+                return;
+            int row = InnerDocGetNewRow(grid);
+
+            // text(s)
+            for (int i = 0; i < cell.Length; i++)
+            {
+                // make the border
+                var brd = uitk.AddSmallBorderTo(grid, row, i,
+                    margin: (i == 0) ? new AnyUiThickness(0, -1, 0, 0)
+                                     : new AnyUiThickness(-1, -1, 0, 0),
+                    borderThickness: new AnyUiThickness(1.0),
+                    borderBrush: AnyUiBrushes.Black);
+
+                var stb = new AnyUiSelectableTextBlock()
+                {
+                    Text = "" + cell[i],
+                    Padding = new AnyUiThickness(1),
+                    FontWeight = (bold != null && bold.Contains(i))
+                        ? AnyUiFontWeight.Bold : null,
+                    TextWrapping = (wrap != null && wrap.Contains(i))
+                        ? AnyUiTextWrapping.Wrap : null,
+                    VerticalAlignment = AnyUiVerticalAlignment.Center,
+                    VerticalContentAlignment = AnyUiVerticalAlignment.Center
+                };
+
+                brd.Child = stb;
+
+                if (centered != null && centered.Contains(i))
+                {
+                    stb.HorizontalAlignment = AnyUiHorizontalAlignment.Center;
+                    stb.HorizontalContentAlignment = AnyUiHorizontalAlignment.Center;
+                }
+            }
+        }
+
         protected void InnerDocAddLifeCycleMilestones(
             AnyUiSmallWidgetToolkit uitk,
             AnyUiGrid grid, int col, 
@@ -656,6 +702,30 @@ protected void InnerDocAddAdditionalInfo(
             }
         }
 
+        protected void InnerDocAddTechnicalDataChanges(
+            AnyUiSmallWidgetToolkit uitk,
+            AnyUiGrid grid, int col,
+            AasClassMapperInfo info)
+        {
+            // access and add row
+            if (grid == null 
+                || !(info?.Referable is Aas.ISubmodelElementCollection smc))
+                return;
+            int row = InnerDocGetNewRow(grid);
+
+            // make inner grid
+            var inner = uitk.Set(
+                uitk.AddSmallGridTo(grid, row, col,
+                    rows: 0, cols: 3,
+                    colWidths: new[] { "#", "*", "#" }),
+                colSpan: _innerDocumentCols - col);
+
+            // add head line
+            InnerDocAddGridCells(uitk, inner,
+                cell: new[] { "IdShort", "SemanticId", "New value" },
+                bold: new[] { 0, 1, 2 });
+        }
+
         protected void RenderPanelInner(
             AnyUiStackPanel view, AnyUiSmallWidgetToolkit uitk,
             PcnOptionsRecord rec,
@@ -871,6 +941,15 @@ protected void RenderPanelInner(
                 }
 
             }
+
+            // technical data - changes
+            if (data.ItemOfChange?.TechnicalData_Changes != null)
+            {
+                InnerDocAddHeadline(uitk, grid, 0, "Given changes of technical data for the item of change", 2);
+
+                InnerDocAddTechnicalDataChanges(uitk, grid, 0,
+                    data.ItemOfChange.TechnicalData_Changes.__Info__);
+            }
         }
 
         #endregion
diff --git a/src/AasxPredefinedConcepts/PackageExplorer.cs b/src/AasxPredefinedConcepts/DefinitionsPackageExplorer.cs
similarity index 100%
rename from src/AasxPredefinedConcepts/PackageExplorer.cs
rename to src/AasxPredefinedConcepts/DefinitionsPackageExplorer.cs
diff --git a/src/AasxPredefinedConcepts/DefinitionsAssetInterfacesDescription.cs b/src/AasxPredefinedConcepts/MappingsAssetInterfacesDescription.cs
similarity index 100%
rename from src/AasxPredefinedConcepts/DefinitionsAssetInterfacesDescription.cs
rename to src/AasxPredefinedConcepts/MappingsAssetInterfacesDescription.cs
diff --git a/src/AasxPredefinedConcepts/DefinitionsAssetInterfacesMapping.cs b/src/AasxPredefinedConcepts/MappingsAssetInterfacesMapping.cs
similarity index 100%
rename from src/AasxPredefinedConcepts/DefinitionsAssetInterfacesMapping.cs
rename to src/AasxPredefinedConcepts/MappingsAssetInterfacesMapping.cs
diff --git a/src/AasxPredefinedConcepts/DefinitionsProductChangeNotifications.cs b/src/AasxPredefinedConcepts/MappingsProductChangeNotifications.cs
similarity index 100%
rename from src/AasxPredefinedConcepts/DefinitionsProductChangeNotifications.cs
rename to src/AasxPredefinedConcepts/MappingsProductChangeNotifications.cs
diff --git a/src/AasxPredefinedConcepts/README/Overview.md b/src/AasxPredefinedConcepts/README/Overview.md
new file mode 100644
index 00000000..d26e15ae
--- /dev/null
+++ b/src/AasxPredefinedConcepts/README/Overview.md
@@ -0,0 +1,65 @@
+# Overview on organization of AASPE predefined concepts
+
+## General
+
+This projects hold a wealth of classes defining concepts, in particular
+semanticIds and class structures. These concepts could be used on 
+*source code level* to avoid having semanticIds as sttring constants.
+
+Nearly everything here was produced by the export function:
+AASPE / File / Export / Export predefined concepts
+
+## Programmers note
+
+As many (!) classes and attributes are declared, these classes seem contribute
+significantly to the loading time of AASPE in general. Basically, these classes
+seem to be loaded on demand by the class loader.
+
+However, when using "Add predefined .." button in References dialogue, the user 
+has to wait some 8sec for the first results, as *ALL* classes are firstly 
+instantiated for this scan.
+
+## Concept model
+
+(Deprecated) approach to provide a switcher between different sets of concepts,
+here for some ZVEI models.
+
+## Convert
+
+Classes used to allow (automatic) converting between different versions of 
+Submodels. Useful to define, when a large user basis is known to use an old
+version of a Submodel.
+
+## Definitions and Resources
+
+Classes providing `CD_xxx` references having constant semanticId in it.
+
+In newer versions of these files, a reflection approach stores the full
+ConceptDescriptions (CDs) in the Resource JSON files and the source code
+links against it.
+
+This is the *preferred approach* to realize predefined data for the AASPE,
+as many functions ("Add predefined ..", "New Submodel ..") can use these
+data automatically.
+
+In order the be properly linked, the classes need to be listed in
+`DefinitionsPool.cs`.
+
+Note: It is recommended, to *NOT* include all symbols by 
+`using AasxPredefinedConcepts`, but to refer to specific classes.
+
+Note: For the sake of shorter source code symbols, the classes in the 
+`DefinitionsXXX` are cut to `XXX` because preferable preceded by 
+`AasxPredefinedConcepts.`.
+
+## Mapping
+
+These classes support an automatic mapping of Submodel structures
+to C# class hierarchies. These classes are 1:1 mapping of the
+SMT structure and contain C# attributes with explicit semanticIds 
+to allow functionality of `PredefinedConceptsClassMapper.cs`.
+
+## Qualifers
+
+These classes pre-define names, semanticIds and functions for
+handling `Qualifiers`.
\ No newline at end of file