diff --git a/SoftwareDesign/Code/2-3-1/2-3-1.pro b/SoftwareDesign/Code/2-3-1/2-3-1.pro
new file mode 100644
index 0000000..b915c09
--- /dev/null
+++ b/SoftwareDesign/Code/2-3-1/2-3-1.pro
@@ -0,0 +1,24 @@
+QT       += core gui
+
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+CONFIG += c++17
+
+# You can make your code fail to compile if it uses deprecated APIs.
+# In order to do so, uncomment the following line.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+SOURCES += \
+    main.cpp \
+    mainwindow.cpp
+
+HEADERS += \
+    mainwindow.h
+
+FORMS += \
+    mainwindow.ui
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /opt/$${TARGET}/bin
+!isEmpty(target.path): INSTALLS += target
diff --git a/SoftwareDesign/Code/2-3-1/main.cpp b/SoftwareDesign/Code/2-3-1/main.cpp
new file mode 100644
index 0000000..fd3e533
--- /dev/null
+++ b/SoftwareDesign/Code/2-3-1/main.cpp
@@ -0,0 +1,11 @@
+#include "mainwindow.h"
+
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    MainWindow w;
+    w.show();
+    return a.exec();
+}
diff --git a/SoftwareDesign/Code/2-3-1/mainwindow.cpp b/SoftwareDesign/Code/2-3-1/mainwindow.cpp
new file mode 100644
index 0000000..41a26bd
--- /dev/null
+++ b/SoftwareDesign/Code/2-3-1/mainwindow.cpp
@@ -0,0 +1,15 @@
+#include "mainwindow.h"
+#include "ui_mainwindow.h"
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent)
+    , ui(new Ui::MainWindow)
+{
+    ui->setupUi(this);
+}
+
+MainWindow::~MainWindow()
+{
+    delete ui;
+}
+
diff --git a/SoftwareDesign/Code/2-3-1/mainwindow.h b/SoftwareDesign/Code/2-3-1/mainwindow.h
new file mode 100644
index 0000000..4643e32
--- /dev/null
+++ b/SoftwareDesign/Code/2-3-1/mainwindow.h
@@ -0,0 +1,21 @@
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+
+QT_BEGIN_NAMESPACE
+namespace Ui { class MainWindow; }
+QT_END_NAMESPACE
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow(QWidget *parent = nullptr);
+    ~MainWindow();
+
+private:
+    Ui::MainWindow *ui;
+};
+#endif // MAINWINDOW_H
diff --git a/SoftwareDesign/Code/2-3-1/mainwindow.ui b/SoftwareDesign/Code/2-3-1/mainwindow.ui
new file mode 100644
index 0000000..9700641
--- /dev/null
+++ b/SoftwareDesign/Code/2-3-1/mainwindow.ui
@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>MainWindow</class>
+ <widget class="QMainWindow" name="MainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>296</width>
+    <height>356</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Widget_connectUI_4490</string>
+  </property>
+  <widget class="QWidget" name="centralwidget">
+   <widget class="QScrollBar" name="horizontalScrollBar">
+    <property name="geometry">
+     <rect>
+      <x>60</x>
+      <y>200</y>
+      <width>160</width>
+      <height>16</height>
+     </rect>
+    </property>
+    <property name="orientation">
+     <enum>Qt::Horizontal</enum>
+    </property>
+   </widget>
+   <widget class="QLabel" name="label">
+    <property name="geometry">
+     <rect>
+      <x>90</x>
+      <y>60</y>
+      <width>77</width>
+      <height>25</height>
+     </rect>
+    </property>
+    <property name="text">
+     <string>TextLabel</string>
+    </property>
+   </widget>
+  </widget>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>296</width>
+     <height>30</height>
+    </rect>
+   </property>
+  </widget>
+  <widget class="QStatusBar" name="statusbar"/>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>horizontalScrollBar</sender>
+   <signal>valueChanged(int)</signal>
+   <receiver>label</receiver>
+   <slot>setNum(int)</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>372</x>
+     <y>318</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>370</x>
+     <y>215</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>