diff --git a/PR2 KI Projekt/fakturama_data.xml b/PR2 KI Projekt/fakturama_data.xml
new file mode 100644
index 0000000..01d8d63
--- /dev/null
+++ b/PR2 KI Projekt/fakturama_data.xml	
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<Fakturama>
+    <Customers/>
+    <Articles/>
+    <Offers/>
+    <OrderConfirmations/>
+    <DeliveryNotes/>
+    <Invoices/>
+</Fakturama>
diff --git a/PR2 KI Projekt/src/Main.java b/PR2 KI Projekt/src/Main.java
index ef47cdc..9b21331 100644
--- a/PR2 KI Projekt/src/Main.java	
+++ b/PR2 KI Projekt/src/Main.java	
@@ -838,6 +838,43 @@ public class Main {
             return defaultValue;
         }
     }
+    
+    public static void deleteCustomer(int index) {
+        if (index >= 0 && index < customers.size()) {
+            customers.remove(index);
+        }
+    }
+
+    public static void deleteArticle(int index) {
+        if (index >= 0 && index < articles.size()) {
+            articles.remove(index);
+        }
+    }
+
+    public static void deleteOffer(int index) {
+        if (index >= 0 && index < offers.size()) {
+            offers.remove(index);
+        }
+    }
+
+    public static void deleteOrderConfirmation(int index) {
+        if (index >= 0 && index < orderConfirmations.size()) {
+            orderConfirmations.remove(index);
+        }
+    }
+
+    public static void deleteDeliveryNote(int index) {
+        if (index >= 0 && index < deliveryNotes.size()) {
+            deliveryNotes.remove(index);
+        }
+    }
+
+    public static void deleteInvoice(int index) {
+        if (index >= 0 && index < invoices.size()) {
+            invoices.remove(index);
+        }
+    }
+
 
 
 }
diff --git a/PR2 KI Projekt/src/MainGUI.java b/PR2 KI Projekt/src/MainGUI.java
index f3ef673..6f0ba77 100644
--- a/PR2 KI Projekt/src/MainGUI.java	
+++ b/PR2 KI Projekt/src/MainGUI.java	
@@ -33,26 +33,50 @@ public class MainGUI {
         JMenuItem addCustomerItem = new JMenuItem("Kunde hinzufügen");
         menu.add(addCustomerItem);
         addCustomerItem.addActionListener(e -> showAddCustomerPanel());
+        
+        JMenuItem deleteCustomerItem = new JMenuItem("Kunde löschen");
+        menu.add(deleteCustomerItem);
+        deleteCustomerItem.addActionListener(e -> showDeleteCustomerPanel());
 
         JMenuItem addArticleItem = new JMenuItem("Artikel hinzufügen");
         menu.add(addArticleItem);
         addArticleItem.addActionListener(e -> showAddArticlePanel());
+        
+        JMenuItem deleteArticleItem = new JMenuItem("Artikel löschen");
+        menu.add(deleteArticleItem);
+        deleteArticleItem.addActionListener(e -> showDeleteArticlePanel());
 
         JMenuItem createOfferItem = new JMenuItem("Angebot erstellen");
         menu.add(createOfferItem);
         createOfferItem.addActionListener(e -> showCreateOfferPanel());
+        
+        JMenuItem deleteOfferItem = new JMenuItem("Angebot löschen");
+        menu.add(deleteOfferItem);
+        deleteOfferItem.addActionListener(e -> showDeleteOfferPanel());
 
         JMenuItem createOrderConfirmationItem = new JMenuItem("Auftragsbestätigung erstellen");
         menu.add(createOrderConfirmationItem);
         createOrderConfirmationItem.addActionListener(e -> showCreateOrderConfirmationPanel());
+        
+        JMenuItem deleteOrderConfirmationItem = new JMenuItem("Auftragsbestätigung löschen");
+        menu.add(deleteOrderConfirmationItem);
+        deleteOrderConfirmationItem.addActionListener(e -> showDeleteOrderConfirmationPanel());
 
         JMenuItem createDeliveryNoteItem = new JMenuItem("Lieferschein erstellen");
         menu.add(createDeliveryNoteItem);
         createDeliveryNoteItem.addActionListener(e -> showCreateDeliveryNotePanel());
+        
+        JMenuItem deleteDeliveryNoteItem = new JMenuItem("Lieferschein löschen");
+        menu.add(deleteDeliveryNoteItem);
+        deleteDeliveryNoteItem.addActionListener(e -> showDeleteDeliveryNotePanel());
 
         JMenuItem createInvoiceItem = new JMenuItem("Rechnung erstellen");
         menu.add(createInvoiceItem);
         createInvoiceItem.addActionListener(e -> showCreateInvoicePanel());
+        
+        JMenuItem deleteInvoiceItem = new JMenuItem("Rechnung löschen");
+        menu.add(deleteInvoiceItem);
+        deleteInvoiceItem.addActionListener(e -> showDeleteInvoicePanel());
 
         JMenuItem saveDataItem = new JMenuItem("Daten speichern");
         menu.add(saveDataItem);
@@ -346,34 +370,219 @@ public class MainGUI {
     private void updateTextArea() {
         StringBuilder sb = new StringBuilder();
         sb.append("Kunden:\n");
-        for (Main.Customer customer : Main.customers) {
-            sb.append(customer.name).append(" - ").append(customer.address).append(" - ").append(customer.contactPerson).append(" - ").append(customer.taxExempt ? "§ 4 UStG" : "").append(" - ").append(customer.smallBusiness ? "Kleinunternehmer" : "").append("\n");
+        for (int i = 0; i < Main.customers.size(); i++) {
+            Main.Customer customer = Main.customers.get(i);
+            sb.append(i + 1).append(". ").append(customer.name).append(" - ").append(customer.address).append(" - ").append(customer.contactPerson).append(" - ").append(customer.taxExempt ? "§ 4 UStG" : "").append(" - ").append(customer.smallBusiness ? "Kleinunternehmer" : "").append("\n");
         }
         sb.append("\nArtikel:\n");
-        for (Main.Article article : Main.articles) {
-            sb.append(article.description).append(" - ").append(article.unit).append(" - ").append(article.netPrice).append(" € - ").append(article.vatRate).append(" %").append("\n");
+        for (int i = 0; i < Main.articles.size(); i++) {
+            Main.Article article = Main.articles.get(i);
+            sb.append(i + 1).append(". ").append(article.description).append(" - ").append(article.unit).append(" - ").append(article.netPrice).append(" € - ").append(article.vatRate).append(" %").append("\n");
         }
         sb.append("\nAngebote:\n");
-        for (Main.Offer offer : Main.offers) {
-            sb.append("Angebot #").append(offer.id).append(" - ").append(offer.customer.name).append(" - ").append(offer.date).append(" - ").append(offer.status).append("\n");
+        for (int i = 0; i < Main.offers.size(); i++) {
+            Main.Offer offer = Main.offers.get(i);
+            sb.append(i + 1).append(". Angebot #").append(offer.id).append(" - ").append(offer.customer.name).append(" - ").append(offer.date).append(" - ").append(offer.status).append("\n");
             for (Main.Article article : offer.articles) {
                 sb.append("  ").append(article.description).append(" - ").append(article.unit).append(" - ").append(article.netPrice).append(" € - ").append(article.vatRate).append(" %").append("\n");
             }
         }
         sb.append("\nAuftragsbestätigungen:\n");
-        for (Main.OrderConfirmation orderConfirmation : Main.orderConfirmations) {
-            sb.append("Auftragsbestätigung #").append(orderConfirmation.id).append(" - ").append(orderConfirmation.offer.customer.name).append(" - ").append(orderConfirmation.date).append(" - ").append(orderConfirmation.status).append("\n");
+        for (int i = 0; i < Main.orderConfirmations.size(); i++) {
+            Main.OrderConfirmation orderConfirmation = Main.orderConfirmations.get(i);
+            sb.append(i + 1).append(". Auftragsbestätigung #").append(orderConfirmation.id).append(" - ").append(orderConfirmation.offer.customer.name).append(" - ").append(orderConfirmation.date).append(" - ").append(orderConfirmation.status).append("\n");
         }
         sb.append("\nLieferscheine:\n");
-        for (Main.DeliveryNote deliveryNote : Main.deliveryNotes) {
-            sb.append("Lieferschein #").append(deliveryNote.id).append(" - ").append(deliveryNote.orderConfirmation.offer.customer.name).append(" - ").append(deliveryNote.date).append(" - ").append(deliveryNote.status).append("\n");
+        for (int i = 0; i < Main.deliveryNotes.size(); i++) {
+            Main.DeliveryNote deliveryNote = Main.deliveryNotes.get(i);
+            sb.append(i + 1).append(". Lieferschein #").append(deliveryNote.id).append(" - ").append(deliveryNote.orderConfirmation.offer.customer.name).append(" - ").append(deliveryNote.date).append(" - ").append(deliveryNote.status).append("\n");
         }
         sb.append("\nRechnungen:\n");
-        for (Main.Invoice invoice : Main.invoices) {
-            sb.append("Rechnung #").append(invoice.id).append(" - ").append(invoice.deliveryNote.orderConfirmation.offer.customer.name).append(" - ").append(invoice.date).append(" - ").append(invoice.status).append("\n");
+        for (int i = 0; i < Main.invoices.size(); i++) {
+            Main.Invoice invoice = Main.invoices.get(i);
+            sb.append(i + 1).append(". Rechnung #").append(invoice.id).append(" - ").append(invoice.deliveryNote.orderConfirmation.offer.customer.name).append(" - ").append(invoice.date).append(" - ").append(invoice.status).append("\n");
         }
         textArea.setText(sb.toString());
     }
+    
+    private void showDeleteCustomerPanel() {
+        JPanel panel = new JPanel(new GridLayout(3, 2));
+        JLabel customerLabel = new JLabel("Kunde:");
+        JComboBox<String> customerBox = new JComboBox<>();
+        for (Main.Customer customer : Main.customers) {
+            customerBox.addItem(customer.name);
+        }
+
+        JButton deleteButton = new JButton("Löschen");
+        deleteButton.setBackground(new Color(255, 99, 71)); // Tomatenrot
+        deleteButton.addActionListener(e -> {
+            String customerName = (String) customerBox.getSelectedItem();
+            Main.customers.removeIf(c -> c.name.equals(customerName));
+            updateTextArea();
+            cardLayout.show(mainPanel, "Home");
+        });
+
+        JButton backButton = new JButton("Zurück");
+        backButton.addActionListener(e -> cardLayout.show(mainPanel, "Home"));
+
+        panel.add(customerLabel);
+        panel.add(customerBox);
+        panel.add(backButton);
+        panel.add(deleteButton);
+
+        mainPanel.add(panel, "DeleteCustomer");
+        cardLayout.show(mainPanel, "DeleteCustomer");
+    }
+
+    private void showDeleteArticlePanel() {
+        JPanel panel = new JPanel(new GridLayout(3, 2));
+        JLabel articleLabel = new JLabel("Artikel:");
+        JComboBox<String> articleBox = new JComboBox<>();
+        for (Main.Article article : Main.articles) {
+            articleBox.addItem(article.description);
+        }
+
+        JButton deleteButton = new JButton("Löschen");
+        deleteButton.setBackground(new Color(255, 99, 71)); // Tomatenrot
+        deleteButton.addActionListener(e -> {
+            String articleDescription = (String) articleBox.getSelectedItem();
+            Main.articles.removeIf(a -> a.description.equals(articleDescription));
+            updateTextArea();
+            cardLayout.show(mainPanel, "Home");
+        });
+
+        JButton backButton = new JButton("Zurück");
+        backButton.addActionListener(e -> cardLayout.show(mainPanel, "Home"));
+
+        panel.add(articleLabel);
+        panel.add(articleBox);
+        panel.add(backButton);
+        panel.add(deleteButton);
+
+        mainPanel.add(panel, "DeleteArticle");
+        cardLayout.show(mainPanel, "DeleteArticle");
+    }
+
+    private void showDeleteOfferPanel() {
+        JPanel panel = new JPanel(new GridLayout(3, 2));
+        JLabel offerLabel = new JLabel("Angebot:");
+        JComboBox<String> offerBox = new JComboBox<>();
+        for (Main.Offer offer : Main.offers) {
+            offerBox.addItem("Angebot #" + offer.id + " - Kunde: " + offer.customer.name);
+        }
+
+        JButton deleteButton = new JButton("Löschen");
+        deleteButton.setBackground(new Color(255, 99, 71)); // Tomatenrot
+        deleteButton.addActionListener(e -> {
+            String offerInfo = (String) offerBox.getSelectedItem();
+            int offerId = Integer.parseInt(offerInfo.split(" ")[1].substring(1));
+            Main.offers.removeIf(o -> o.id == offerId);
+            updateTextArea();
+            cardLayout.show(mainPanel, "Home");
+        });
+
+        JButton backButton = new JButton("Zurück");
+        backButton.addActionListener(e -> cardLayout.show(mainPanel, "Home"));
+
+        panel.add(offerLabel);
+        panel.add(offerBox);
+        panel.add(backButton);
+        panel.add(deleteButton);
+
+        mainPanel.add(panel, "DeleteOffer");
+        cardLayout.show(mainPanel, "DeleteOffer");
+    }
+
+    private void showDeleteOrderConfirmationPanel() {
+        JPanel panel = new JPanel(new GridLayout(3, 2));
+        JLabel orderConfirmationLabel = new JLabel("Auftragsbestätigung:");
+        JComboBox<String> orderConfirmationBox = new JComboBox<>();
+        for (Main.OrderConfirmation orderConfirmation : Main.orderConfirmations) {
+            orderConfirmationBox.addItem("Auftragsbestätigung #" + orderConfirmation.id + " - Kunde: " + orderConfirmation.offer.customer.name);
+        }
+
+        JButton deleteButton = new JButton("Löschen");
+        deleteButton.setBackground(new Color(255, 99, 71)); // Tomatenrot
+        deleteButton.addActionListener(e -> {
+            String orderConfirmationInfo = (String) orderConfirmationBox.getSelectedItem();
+            int orderConfirmationId = Integer.parseInt(orderConfirmationInfo.split(" ")[1].substring(1));
+            Main.orderConfirmations.removeIf(oc -> oc.id == orderConfirmationId);
+            updateTextArea();
+            cardLayout.show(mainPanel, "Home");
+        });
+
+        JButton backButton = new JButton("Zurück");
+        backButton.addActionListener(e -> cardLayout.show(mainPanel, "Home"));
+
+        panel.add(orderConfirmationLabel);
+        panel.add(orderConfirmationBox);
+        panel.add(backButton);
+        panel.add(deleteButton);
+
+        mainPanel.add(panel, "DeleteOrderConfirmation");
+        cardLayout.show(mainPanel, "DeleteOrderConfirmation");
+    }
+
+    private void showDeleteDeliveryNotePanel() {
+        JPanel panel = new JPanel(new GridLayout(3, 2));
+        JLabel deliveryNoteLabel = new JLabel("Lieferschein:");
+        JComboBox<String> deliveryNoteBox = new JComboBox<>();
+        for (Main.DeliveryNote deliveryNote : Main.deliveryNotes) {
+            deliveryNoteBox.addItem("Lieferschein #" + deliveryNote.id + " - Kunde: " + deliveryNote.orderConfirmation.offer.customer.name);
+        }
+
+        JButton deleteButton = new JButton("Löschen");
+        deleteButton.setBackground(new Color(255, 99, 71)); // Tomatenrot
+        deleteButton.addActionListener(e -> {
+            String deliveryNoteInfo = (String) deliveryNoteBox.getSelectedItem();
+            int deliveryNoteId = Integer.parseInt(deliveryNoteInfo.split(" ")[1].substring(1));
+            Main.deliveryNotes.removeIf(dn -> dn.id == deliveryNoteId);
+            updateTextArea();
+            cardLayout.show(mainPanel, "Home");
+        });
+
+        JButton backButton = new JButton("Zurück");
+        backButton.addActionListener(e -> cardLayout.show(mainPanel, "Home"));
+
+        panel.add(deliveryNoteLabel);
+        panel.add(deliveryNoteBox);
+        panel.add(backButton);
+        panel.add(deleteButton);
+
+        mainPanel.add(panel, "DeleteDeliveryNote");
+        cardLayout.show(mainPanel, "DeleteDeliveryNote");
+    }
+
+    private void showDeleteInvoicePanel() {
+        JPanel panel = new JPanel(new GridLayout(3, 2));
+        JLabel invoiceLabel = new JLabel("Rechnung:");
+        JComboBox<String> invoiceBox = new JComboBox<>();
+        for (Main.Invoice invoice : Main.invoices) {
+            invoiceBox.addItem("Rechnung #" + invoice.id + " - Kunde: " + invoice.deliveryNote.orderConfirmation.offer.customer.name);
+        }
+
+        JButton deleteButton = new JButton("Löschen");
+        deleteButton.setBackground(new Color(255, 99, 71)); // Tomatenrot
+        deleteButton.addActionListener(e -> {
+            String invoiceInfo = (String) invoiceBox.getSelectedItem();
+            int invoiceId = Integer.parseInt(invoiceInfo.split(" ")[1].substring(1));
+            Main.invoices.removeIf(i -> i.id == invoiceId);
+            updateTextArea();
+            cardLayout.show(mainPanel, "Home");
+        });
+
+        JButton backButton = new JButton("Zurück");
+        backButton.addActionListener(e -> cardLayout.show(mainPanel, "Home"));
+
+        panel.add(invoiceLabel);
+        panel.add(invoiceBox);
+        panel.add(backButton);
+        panel.add(deleteButton);
+
+        mainPanel.add(panel, "DeleteInvoice");
+        cardLayout.show(mainPanel, "DeleteInvoice");
+    }
+
 
     public static void main(String[] args) {
         EventQueue.invokeLater(() -> {