diff --git a/gui/include/Visualization/IVisualizationWidget.h b/gui/include/Visualization/IVisualizationWidget.h
new file mode 100644
index 0000000..1db67c2
--- /dev/null
+++ b/gui/include/Visualization/IVisualizationWidget.h
@@ -0,0 +1,24 @@
+#ifndef SCIQLOP_IVISUALIZATIONWIDGET_H
+#define SCIQLOP_IVISUALIZATIONWIDGET_H
+
+#include "Visualization/IVisualizationWidgetVisitor.h"
+
+#include <QString>
+#include <memory>
+
+/**
+ * @brief The IVisualizationWidget handles the visualization widget.
+ */
+class IVisualizationWidget {
+
+public:
+    virtual ~IVisualizationWidget() = default;
+
+    /// Initializes the plugin
+    virtual void accept(IVisualizationWidget *visitor) = 0;
+    virtual void close() = 0;
+    virtual QString name() = 0;
+};
+
+
+#endif // SCIQLOP_IVISUALIZATIONWIDGET_H
diff --git a/gui/include/Visualization/IVisualizationWidgetVisitor.h b/gui/include/Visualization/IVisualizationWidgetVisitor.h
new file mode 100644
index 0000000..33ce5b9
--- /dev/null
+++ b/gui/include/Visualization/IVisualizationWidgetVisitor.h
@@ -0,0 +1,25 @@
+#ifndef SCIQLOP_IVISUALIZATIONWIDGETVISITOR_H
+#define SCIQLOP_IVISUALIZATIONWIDGETVISITOR_H
+
+
+class VisualizationWidget;
+class VisualizationTabWidget;
+class VisualizationZoneWidget;
+class VisualizationGraphWidget;
+
+/**
+ * @brief The IVisualizationWidgetVisitor handles the visualization widget vistor pattern.
+ */
+class IVisualizationWidgetVisitor {
+
+public:
+    virtual ~IVisualizationWidgetVisitor() = default;
+
+    virtual void visit(VisualizationWidget *widget) = 0;
+    virtual void visit(VisualizationTabWidget *tabWidget) = 0;
+    virtual void visit(VisualizationZoneWidget *zoneWidget) = 0;
+    virtual void visit(VisualizationGraphWidget *graphWidget) = 0;
+};
+
+
+#endif // SCIQLOP_IVISUALIZATIONWIDGETVISITOR_H
diff --git a/gui/include/Visualization/VisualizationGraphWidget.h b/gui/include/Visualization/VisualizationGraphWidget.h
index b1f5e7f..093325a 100644
--- a/gui/include/Visualization/VisualizationGraphWidget.h
+++ b/gui/include/Visualization/VisualizationGraphWidget.h
@@ -1,21 +1,39 @@
 #ifndef SCIQLOP_VISUALIZATIONGRAPHWIDGET_H
 #define SCIQLOP_VISUALIZATIONGRAPHWIDGET_H
 
+#include "Visualization/IVisualizationWidget.h"
+
 #include <QWidget>
 
+#include <memory>
+
+#include <Common/spimpl.h>
+
+class Variable;
+
 namespace Ui {
 class VisualizationGraphWidget;
 } // namespace Ui
 
-class VisualizationGraphWidget : public QWidget {
+class VisualizationGraphWidget : public QWidget, public IVisualizationWidget {
     Q_OBJECT
 
 public:
     explicit VisualizationGraphWidget(QWidget *parent = 0);
     virtual ~VisualizationGraphWidget();
 
+    void addVariable(std::shared_ptr<Variable> variable);
+
+    // IVisualizationWidget interface
+    void accept(IVisualizationWidget *visitor);
+    void close();
+    QString name();
+
 private:
     Ui::VisualizationGraphWidget *ui;
+
+    class VisualizationGraphWidgetPrivate;
+    spimpl::unique_impl_ptr<VisualizationGraphWidgetPrivate> impl;
 };
 
 #endif // SCIQLOP_VISUALIZATIONGRAPHWIDGET_H
diff --git a/gui/include/Visualization/VisualizationTabWidget.h b/gui/include/Visualization/VisualizationTabWidget.h
index a3a9d49..b61678e 100644
--- a/gui/include/Visualization/VisualizationTabWidget.h
+++ b/gui/include/Visualization/VisualizationTabWidget.h
@@ -1,19 +1,37 @@
 #ifndef SCIQLOP_VISUALIZATIONTABWIDGET_H
 #define SCIQLOP_VISUALIZATIONTABWIDGET_H
 
+#include "Visualization/IVisualizationWidget.h"
+
 #include <QWidget>
 
+class VisualizationZoneWidget;
+
 namespace Ui {
 class VisualizationTabWidget;
 } // namespace Ui
 
-class VisualizationTabWidget : public QWidget {
+class VisualizationTabWidget : public QWidget, public IVisualizationWidget {
     Q_OBJECT
 
 public:
     explicit VisualizationTabWidget(QWidget *parent = 0);
     virtual ~VisualizationTabWidget();
 
+    /// Add a zone widget
+    void addZone(VisualizationZoneWidget *zoneWidget);
+
+    /// Create a zone using a Variable
+    VisualizationZoneWidget *createZone();
+
+    /// Remove a zone
+    void removeZone(VisualizationZoneWidget *zone);
+
+    // IVisualizationWidget interface
+    void accept(IVisualizationWidget *visitor);
+    void close();
+    QString name();
+
 private:
     Ui::VisualizationTabWidget *ui;
 };
diff --git a/gui/include/Visualization/VisualizationWidget.h b/gui/include/Visualization/VisualizationWidget.h
index 280783a..7f54756 100644
--- a/gui/include/Visualization/VisualizationWidget.h
+++ b/gui/include/Visualization/VisualizationWidget.h
@@ -1,22 +1,40 @@
 #ifndef SCIQLOP_VISUALIZATIONWIDGET_H
 #define SCIQLOP_VISUALIZATIONWIDGET_H
 
+#include "Visualization/IVisualizationWidget.h"
+
 #include <QLoggingCategory>
 #include <QWidget>
 
+class VisualizationTabWidget;
+
 Q_DECLARE_LOGGING_CATEGORY(LOG_VisualizationWidget)
 
 namespace Ui {
 class VisualizationWidget;
 } // namespace Ui
 
-class VisualizationWidget : public QWidget {
+class VisualizationWidget : public QWidget, public IVisualizationWidget {
     Q_OBJECT
 
 public:
     explicit VisualizationWidget(QWidget *parent = 0);
     virtual ~VisualizationWidget();
 
+    /// Add a zone widget
+    virtual void addTab(VisualizationTabWidget *tabWidget);
+
+    /// Create a tab using a Variable
+    VisualizationTabWidget *createTab();
+
+    /// Remove a tab
+    void removeTab(VisualizationTabWidget *tab);
+
+    // IVisualizationWidget interface
+    void accept(IVisualizationWidget *visitor);
+    void close();
+    QString name();
+
 private:
     Ui::VisualizationWidget *ui;
 };
diff --git a/gui/include/Visualization/VisualizationZoneWidget.h b/gui/include/Visualization/VisualizationZoneWidget.h
index ba591f1..a8f67e1 100644
--- a/gui/include/Visualization/VisualizationZoneWidget.h
+++ b/gui/include/Visualization/VisualizationZoneWidget.h
@@ -1,19 +1,37 @@
 #ifndef SCIQLOP_VISUALIZATIONZONEWIDGET_H
 #define SCIQLOP_VISUALIZATIONZONEWIDGET_H
 
+#include "Visualization/IVisualizationWidget.h"
+
+class VisualizationGraphWidget;
+
 #include <QWidget>
 
 namespace Ui {
 class VisualizationZoneWidget;
 } // Ui
 
-class VisualizationZoneWidget : public QWidget {
+class VisualizationZoneWidget : public QWidget, public IVisualizationWidget {
     Q_OBJECT
 
 public:
     explicit VisualizationZoneWidget(QWidget *parent = 0);
     virtual ~VisualizationZoneWidget();
 
+    /// Add a graph widget
+    void addGraph(VisualizationGraphWidget *graphWidget);
+
+    /// Create a graph using a Variable
+    VisualizationGraphWidget *createGraph();
+
+    /// Remove a graph
+    void removeGraph(VisualizationGraphWidget *graph);
+
+    // IVisualizationWidget interface
+    void accept(IVisualizationWidget *visitor);
+    void close();
+    QString name();
+
 private:
     Ui::VisualizationZoneWidget *ui;
 };
diff --git a/gui/src/Visualization/VisualizationGraphWidget.cpp b/gui/src/Visualization/VisualizationGraphWidget.cpp
index 275198e..da69420 100644
--- a/gui/src/Visualization/VisualizationGraphWidget.cpp
+++ b/gui/src/Visualization/VisualizationGraphWidget.cpp
@@ -1,8 +1,21 @@
 #include "Visualization/VisualizationGraphWidget.h"
 #include "ui_VisualizationGraphWidget.h"
 
+#include <Variable/Variable.h>
+
+#include <unordered_map>
+
+struct VisualizationGraphWidget::VisualizationGraphWidgetPrivate {
+
+    // 1 variable -> n qcpplot
+    std::unordered_map<std::shared_ptr<Variable>, std::unique_ptr<QCPAbstractPlottable> >
+        m_VariableToPlotMap;
+};
+
 VisualizationGraphWidget::VisualizationGraphWidget(QWidget *parent)
-        : QWidget(parent), ui(new Ui::VisualizationGraphWidget)
+        : QWidget(parent),
+          ui(new Ui::VisualizationGraphWidget),
+          impl{spimpl::make_unique_impl<VisualizationGraphWidgetPrivate>()}
 {
     ui->setupUi(this);
 }
@@ -11,3 +24,24 @@ VisualizationGraphWidget::~VisualizationGraphWidget()
 {
     delete ui;
 }
+
+void VisualizationGraphWidget::addVariable(std::shared_ptr<Variable> variable)
+{
+    // todo: first check is variable contains data then check how many plot have to be created
+}
+
+void VisualizationGraphWidget::accept(IVisualizationWidget *visitor)
+{
+    // TODO: manage the visitor
+}
+
+void VisualizationGraphWidget::close()
+{
+    // The main view cannot be directly closed.
+    return;
+}
+
+QString VisualizationGraphWidget::name()
+{
+    return QStringLiteral("MainView");
+}
diff --git a/gui/src/Visualization/VisualizationTabWidget.cpp b/gui/src/Visualization/VisualizationTabWidget.cpp
index 7a3655a..0718406 100644
--- a/gui/src/Visualization/VisualizationTabWidget.cpp
+++ b/gui/src/Visualization/VisualizationTabWidget.cpp
@@ -1,13 +1,50 @@
 #include "Visualization/VisualizationTabWidget.h"
 #include "ui_VisualizationTabWidget.h"
 
+#include "Visualization/VisualizationZoneWidget.h"
+
+
 VisualizationTabWidget::VisualizationTabWidget(QWidget *parent)
         : QWidget{parent}, ui{new Ui::VisualizationTabWidget}
 {
     ui->setupUi(this);
+
 }
 
 VisualizationTabWidget::~VisualizationTabWidget()
 {
     delete ui;
 }
+
+void VisualizationTabWidget::addZone(VisualizationZoneWidget *zoneWidget)
+{
+    this->layout()->addWidget(zoneWidget);
+}
+
+VisualizationZoneWidget *VisualizationTabWidget::createZone()
+{
+    auto zoneWidget = new VisualizationZoneWidget(this);
+    this->addZone(zoneWidget);
+
+    return zoneWidget;
+}
+
+void VisualizationTabWidget::removeZone(VisualizationZoneWidget *zone)
+{
+}
+
+void VisualizationTabWidget::accept(IVisualizationWidget *visitor)
+{
+    // TODO: manage the visitor
+}
+
+void VisualizationTabWidget::close()
+{
+    // The main view cannot be directly closed.
+    return;
+}
+
+QString VisualizationTabWidget::name()
+{
+    return QStringLiteral("MainView");
+}
diff --git a/gui/src/Visualization/VisualizationWidget.cpp b/gui/src/Visualization/VisualizationWidget.cpp
index 91c1f61..d09a4f1 100644
--- a/gui/src/Visualization/VisualizationWidget.cpp
+++ b/gui/src/Visualization/VisualizationWidget.cpp
@@ -1,12 +1,11 @@
 #include "Visualization/VisualizationWidget.h"
 #include "Visualization/VisualizationTabWidget.h"
+#include "Visualization/qcustomplot.h"
+
 #include "ui_VisualizationWidget.h"
 
-#include <QDebug>
 #include <QToolButton>
 
-#include "iostream"
-
 Q_LOGGING_CATEGORY(LOG_VisualizationWidget, "VisualizationWidget")
 
 VisualizationWidget::VisualizationWidget(QWidget *parent)
@@ -41,3 +40,35 @@ VisualizationWidget::~VisualizationWidget()
 {
     delete ui;
 }
+
+void VisualizationWidget::addTab(VisualizationTabWidget *tabWidget)
+{
+    // NOTE: check is this method has to be deleted because of its dupplicated version visible as
+    // lambda function (in the constructor)
+}
+
+VisualizationTabWidget *VisualizationWidget::createTab()
+{
+}
+
+void VisualizationWidget::removeTab(VisualizationTabWidget *tab)
+{
+    // NOTE: check is this method has to be deleted because of its dupplicated version visible as
+    // lambda function (in the constructor)
+}
+
+void VisualizationWidget::accept(IVisualizationWidget *visitor)
+{
+    // TODO: manage the visitor
+}
+
+void VisualizationWidget::close()
+{
+    // The main view cannot be directly closed.
+    return;
+}
+
+QString VisualizationWidget::name()
+{
+    return QStringLiteral("MainView");
+}
diff --git a/gui/src/Visualization/VisualizationZoneWidget.cpp b/gui/src/Visualization/VisualizationZoneWidget.cpp
index ea7a0fb..3c7393e 100644
--- a/gui/src/Visualization/VisualizationZoneWidget.cpp
+++ b/gui/src/Visualization/VisualizationZoneWidget.cpp
@@ -1,6 +1,8 @@
 #include "Visualization/VisualizationZoneWidget.h"
 #include "ui_VisualizationZoneWidget.h"
 
+#include "Visualization/VisualizationGraphWidget.h"
+
 VisualizationZoneWidget::VisualizationZoneWidget(QWidget *parent)
         : QWidget{parent}, ui{new Ui::VisualizationZoneWidget}
 {
@@ -11,3 +13,36 @@ VisualizationZoneWidget::~VisualizationZoneWidget()
 {
     delete ui;
 }
+
+void VisualizationZoneWidget::addGraph(VisualizationGraphWidget *graphWidget)
+{
+    ui->visualizationZoneFrame->layout()->addWidget(graphWidget);
+}
+
+VisualizationGraphWidget *VisualizationZoneWidget::createGraph()
+{
+    auto graphWidget = new VisualizationGraphWidget(this);
+    this->addGraph(graphWidget);
+
+    return graphWidget;
+}
+
+void VisualizationZoneWidget::removeGraph(VisualizationGraphWidget *graph)
+{
+}
+
+void VisualizationZoneWidget::accept(IVisualizationWidget *visitor)
+{
+    // TODO: manage the visitor
+}
+
+void VisualizationZoneWidget::close()
+{
+    // The main view cannot be directly closed.
+    return;
+}
+
+QString VisualizationZoneWidget::name()
+{
+    return QStringLiteral("MainView");
+}
diff --git a/gui/ui/sidepane/SqpSidePane.ui b/gui/ui/Sidepane/SqpSidePane.ui
similarity index 100%
rename from gui/ui/sidepane/SqpSidePane.ui
rename to gui/ui/Sidepane/SqpSidePane.ui
diff --git a/gui/ui/visualization/VisualizationGraphWidget.ui b/gui/ui/Visualization/VisualizationGraphWidget.ui
similarity index 60%
rename from gui/ui/visualization/VisualizationGraphWidget.ui
rename to gui/ui/Visualization/VisualizationGraphWidget.ui
index c7c4fd0..bcecbc4 100644
--- a/gui/ui/visualization/VisualizationGraphWidget.ui
+++ b/gui/ui/Visualization/VisualizationGraphWidget.ui
@@ -1,9 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
- <author/>
- <comment/>
- <exportmacro/>
  <class>VisualizationGraphWidget</class>
- <widget name="VisualizationGraphWidget" class="QWidget">
+ <widget class="QWidget" name="VisualizationGraphWidget">
   <property name="geometry">
    <rect>
     <x>0</x>
@@ -15,7 +13,20 @@
   <property name="windowTitle">
    <string>Form</string>
   </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <widget class="QCustomPlot" name="widget" native="true"/>
+   </item>
+  </layout>
  </widget>
- <pixmapfunction/>
+ <customwidgets>
+  <customwidget>
+   <class>QCustomPlot</class>
+   <extends>QWidget</extends>
+   <header>Visualization/qcustomplot.h</header>
+   <container>1</container>
+  </customwidget>
+ </customwidgets>
+ <resources/>
  <connections/>
 </ui>
diff --git a/gui/ui/visualization/VisualizationTabWidget.ui b/gui/ui/Visualization/VisualizationTabWidget.ui
similarity index 78%
rename from gui/ui/visualization/VisualizationTabWidget.ui
rename to gui/ui/Visualization/VisualizationTabWidget.ui
index 543adda..96002e1 100644
--- a/gui/ui/visualization/VisualizationTabWidget.ui
+++ b/gui/ui/Visualization/VisualizationTabWidget.ui
@@ -1,9 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
- <author/>
- <comment/>
- <exportmacro/>
  <class>VisualizationTabWidget</class>
- <widget name="VisualizationTabWidget" class="QWidget">
+ <widget class="QWidget" name="VisualizationTabWidget">
   <property name="geometry">
    <rect>
     <x>0</x>
@@ -15,7 +13,8 @@
   <property name="windowTitle">
    <string>Form</string>
   </property>
+  <layout class="QVBoxLayout" name="verticalLayout"/>
  </widget>
- <pixmapfunction/>
+ <resources/>
  <connections/>
 </ui>
diff --git a/gui/ui/visualization/VisualizationWidget.ui b/gui/ui/Visualization/VisualizationWidget.ui
similarity index 100%
rename from gui/ui/visualization/VisualizationWidget.ui
rename to gui/ui/Visualization/VisualizationWidget.ui
diff --git a/gui/ui/visualization/VisualizationZoneWidget.ui b/gui/ui/Visualization/VisualizationZoneWidget.ui
similarity index 60%
rename from gui/ui/visualization/VisualizationZoneWidget.ui
rename to gui/ui/Visualization/VisualizationZoneWidget.ui
index ca440d1..fa0dae3 100644
--- a/gui/ui/visualization/VisualizationZoneWidget.ui
+++ b/gui/ui/Visualization/VisualizationZoneWidget.ui
@@ -1,9 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <ui version="4.0">
- <author/>
- <comment/>
- <exportmacro/>
  <class>VisualizationZoneWidget</class>
- <widget name="VisualizationZoneWidget" class="QWidget">
+ <widget class="QWidget" name="VisualizationZoneWidget">
   <property name="geometry">
    <rect>
     <x>0</x>
@@ -15,7 +13,20 @@
   <property name="windowTitle">
    <string>Form</string>
   </property>
+  <layout class="QVBoxLayout" name="verticalLayout_2">
+   <item>
+    <widget class="QFrame" name="visualizationZoneFrame">
+     <property name="frameShape">
+      <enum>QFrame::StyledPanel</enum>
+     </property>
+     <property name="frameShadow">
+      <enum>QFrame::Raised</enum>
+     </property>
+     <layout class="QVBoxLayout" name="verticalLayout"/>
+    </widget>
+   </item>
+  </layout>
  </widget>
- <pixmapfunction/>
+ <resources/>
  <connections/>
 </ui>