diff --git a/src/BaselineOfPolyMath/BaselineOfPolyMath.class.st b/src/BaselineOfPolyMath/BaselineOfPolyMath.class.st
index 5de81fa1..da03299e 100644
--- a/src/BaselineOfPolyMath/BaselineOfPolyMath.class.st
+++ b/src/BaselineOfPolyMath/BaselineOfPolyMath.class.st
@@ -137,6 +137,7 @@ BaselineOfPolyMath >> packages: spec [
 					   'Math-StatisticalMoments' 'Math-Series' ) ];
 		package: 'Math-FastFourierTransform'
 		with: [ spec requires: #( 'Math-Complex' ) ];
+		package: 'Math-UI';
 		package: 'Math-FunctionFit' with: [
 			spec requires:
 					#( 'Math-Numerical' 'Math-Chromosome' 'Math-Accuracy-Core'
diff --git a/src/Math-FunctionFit/PMDataHolder.class.st b/src/Math-FunctionFit/PMDataHolder.class.st
index 4c7a7fa6..a1ecf2d1 100644
--- a/src/Math-FunctionFit/PMDataHolder.class.st
+++ b/src/Math-FunctionFit/PMDataHolder.class.st
@@ -15,3 +15,19 @@ PMDataHolder >> pointsAndErrorsDo: aBlock [
 	self do:
 		[ :each | aBlock value: (PMWeightedPoint point: each)]
 ]
+
+{ #category : 'printing' }
+PMDataHolder >> printOn: aStream [
+
+    aStream << 'Data size '.
+    self size printOn: aStream.
+    aStream << ' '.
+
+    self shouldBePrintedAsLiteral ifTrue: [ 
+	    self printAsLiteralFormOn: aStream. 
+	    ^ self ].
+    self isSelfEvaluating ifTrue: [ 
+        self printAsSelfEvaluatingFormOn: aStream ].
+    [ self printElementsOn: aStream ]
+        on: Error do: [ aStream << 'Failing printOn: is getting printed.' ]
+]
diff --git a/src/Math-FunctionFit/PMFunctionPrinter.class.st b/src/Math-FunctionFit/PMFunctionPrinter.class.st
index 4619452b..b4c056ed 100644
--- a/src/Math-FunctionFit/PMFunctionPrinter.class.st
+++ b/src/Math-FunctionFit/PMFunctionPrinter.class.st
@@ -8,5 +8,5 @@ Class {
 { #category : 'printing' }
 PMFunctionPrinter >> printFunction: aFunction [
 
-	^ aFunction compiledBlock sourceNode sourceCode
+	^ aFunction compiledBlock sourceNode body sourceCode
 ]
diff --git a/src/Math-FunctionFit/PMGeneralFunctionFit.class.st b/src/Math-FunctionFit/PMGeneralFunctionFit.class.st
index 59319237..3503b753 100644
--- a/src/Math-FunctionFit/PMGeneralFunctionFit.class.st
+++ b/src/Math-FunctionFit/PMGeneralFunctionFit.class.st
@@ -241,23 +241,6 @@ PMGeneralFunctionFit >> precision [
 ^geneticOptimizer precision
 ]
 
-{ #category : 'printing' }
-PMGeneralFunctionFit >> printOn: aStream [
-
-	aStream
-		nextPutAll: 'a ';
-		nextPutAll: self class name;
-		nextPut: $(;
-		print: geneticOptimizer;
-		nextPutAll: ' with data of size: ';
-		print: data size.
-	dataTruncated ifTrue: [
-			aStream
-				nextPutAll: ' truncated to: ';
-				print: self optimizer functionBlock data size ].
-	aStream nextPut: $)
-]
-
 { #category : 'accessing' }
 PMGeneralFunctionFit >> quartile [
 ^errorFunction quartile
diff --git a/src/Math-UI/PMErrorOfParameterFunction.extension.st b/src/Math-UI/PMErrorOfParameterFunction.extension.st
new file mode 100644
index 00000000..97428743
--- /dev/null
+++ b/src/Math-UI/PMErrorOfParameterFunction.extension.st
@@ -0,0 +1,32 @@
+Extension { #name : 'PMErrorOfParameterFunction' }
+
+{ #category : '*Math-UI' }
+PMErrorOfParameterFunction >> inspectorFunctionPlotTab: aBuilder [
+
+    <inspectorPresentationOrder: 1 title: 'Error function plot'>
+    ^ (PMFunctionPlotter onData: data) buildPlotPresenter: aBuilder
+]
+
+{ #category : '*Math-UI' }
+PMErrorOfParameterFunction >> inspectorTable: aBuilder [
+
+    <inspectorPresentationOrder: 2 title: 'Error function parameters'>
+
+    ^ PMTablePresenterInspectorBuilder new
+        tableItems: self inspectorTableParametersItems;
+        buildTable: aBuilder
+]
+
+{ #category : '*Math-UI' }
+PMErrorOfParameterFunction >> inspectorTableParametersItems [
+
+    | items |
+    items := {
+                 ('Function' -> (PMFunctionPrinter new printFunction: function)).
+                 ('RelativeError' -> relative).
+                 ('Error type' -> errorType) }.
+    items := items collect: [ :e | StInspectorAssociationNode hostObject: e ].
+    (#( #quartile #insensitive ) includes: errorType) ifTrue: [
+        items add: (StInspectorAssociationNode hostObject: 'With quartile' -> quartile) ].
+    ^ items
+]
diff --git a/src/Math-UI/PMFunctionPlotter.class.st b/src/Math-UI/PMFunctionPlotter.class.st
new file mode 100644
index 00000000..1ff63b9e
--- /dev/null
+++ b/src/Math-UI/PMFunctionPlotter.class.st
@@ -0,0 +1,34 @@
+Class {
+	#name : 'PMFunctionPlotter',
+	#superclass : 'Object',
+	#instVars : [
+		'data'
+	],
+	#category : 'Math-UI',
+	#package : 'Math-UI'
+}
+
+{ #category : 'as yet unclassified' }
+PMFunctionPlotter class >> onData: aCollection [ 
+
+	^ self new
+		data: aCollection;
+		yourself
+]
+
+{ #category : 'as yet unclassified' }
+PMFunctionPlotter >> buildPlotPresenter: aBuilder [
+
+    | plot |
+    plot := RSLinePlot points: data.
+    plot build.
+    ^ (aBuilder instantiate: SpRoassalInspectorPresenter)
+          canvas: plot canvas;
+          yourself
+]
+
+{ #category : 'accessing' }
+PMFunctionPlotter >> data: aCollection [
+
+    data := aCollection
+]
diff --git a/src/Math-UI/PMGeneralFunctionFit.extension.st b/src/Math-UI/PMGeneralFunctionFit.extension.st
new file mode 100644
index 00000000..6955a9b6
--- /dev/null
+++ b/src/Math-UI/PMGeneralFunctionFit.extension.st
@@ -0,0 +1,31 @@
+Extension { #name : 'PMGeneralFunctionFit' }
+
+{ #category : '*Math-UI' }
+PMGeneralFunctionFit >> inspectorFunctionPlotTab: aBuilder [
+
+    <inspectorPresentationOrder: 1 title: 'Function plot'>
+    ^ (PMFunctionPlotter onData: data) buildPlotPresenter: aBuilder
+]
+
+{ #category : '*Math-UI' }
+PMGeneralFunctionFit >> inspectorTable: aBuilder [
+
+    <inspectorPresentationOrder: 2 title: 'Function parameters'>
+
+    ^ PMTablePresenterInspectorBuilder new
+        tableItems: self inspectorTableParametersItems;
+        buildTable: aBuilder
+]
+
+{ #category : '*Math-UI' }
+PMGeneralFunctionFit >> inspectorTableParametersItems [
+
+    | items |
+    items := {
+                 ('Generic optimizer' -> geneticOptimizer).
+                 ('Data' -> data) }.
+    items := items collect: [ :e | StInspectorAssociationNode hostObject: e ].
+    dataTruncated ifTrue: [
+            items add: (StInspectorAssociationNode hostObject: 'Truncated to' -> geneticOptimizer functionBlock data size) ].
+    ^ items
+]
diff --git a/src/Math-UI/PMTablePresenterInspectorBuilder.class.st b/src/Math-UI/PMTablePresenterInspectorBuilder.class.st
new file mode 100644
index 00000000..2e0fde3f
--- /dev/null
+++ b/src/Math-UI/PMTablePresenterInspectorBuilder.class.st
@@ -0,0 +1,28 @@
+Class {
+	#name : 'PMTablePresenterInspectorBuilder',
+	#superclass : 'Object',
+	#instVars : [
+		'tableAssociationItems'
+	],
+	#category : 'Math-UI',
+	#package : 'Math-UI'
+}
+
+{ #category : 'as yet unclassified' }
+PMTablePresenterInspectorBuilder >> buildTable: aBuilder [
+
+	 | tablePresenter |
+    tablePresenter := aBuilder newTable.
+    tablePresenter
+        addColumn: (SpStringTableColumn title: 'Name' evaluated: #key);
+        addColumn: (SpStringTableColumn title: 'Value' evaluated: #value);
+        items: tableAssociationItems;
+        beResizable.
+    ^ tablePresenter
+]
+
+{ #category : 'as yet unclassified' }
+PMTablePresenterInspectorBuilder >> tableItems: aCollection [
+
+    tableAssociationItems := aCollection
+]
diff --git a/src/Math-UI/package.st b/src/Math-UI/package.st
new file mode 100644
index 00000000..59c72d26
--- /dev/null
+++ b/src/Math-UI/package.st
@@ -0,0 +1 @@
+Package { #name : 'Math-UI' }