diff --git a/src/Motorradvermietung.cpp b/src/Motorradvermietung.cpp
index 026bd3e..ac53dd2 100644
--- a/src/Motorradvermietung.cpp
+++ b/src/Motorradvermietung.cpp
@@ -1,8 +1,41 @@
 #include <iostream>
 #include <string>
+#include <list>
 
 using namespace std;
 
+/**
+ * \brief ask a question and get a answer.
+ * \tparam T return parameter
+ * \param question the question.
+ * \return the value.
+ */
+template <typename T>
+T ask_question(const string& question)
+{
+    cout << question << ": ";
+    T value;
+    cin >> value;
+    return value;
+}
+
+bool ask_question(const string& question)
+{
+    while (true)
+    {
+        const auto answer = ask_question<char>(question + " (J/N)");
+        if (answer == 'j' || answer == 'J')
+        {
+            return true;
+        }
+        if (answer == 'n' || answer == 'N')
+        {
+            return false;
+        }
+        cout << "Ungueltige Eigabe. Bitte noch einmal versuchen!";
+    }
+}
+
 class address final
 {
 private:
@@ -11,12 +44,48 @@ private:
     string postal_code_;
     string city_;
 public:
-    address(const string&& street, const string&& street_no, const string&& postal_code, const string&& city) : street_(street), 
-                                                                                                                street_no_(street_no),
-                                                                                                                postal_code_(postal_code), 
-                                                                                                                city_(city)
+    address() = default;
+
+    address(const string&& street, const string&& street_no, const string&& postal_code, const string&& city) :
+        street_(street),
+        street_no_(street_no),
+        postal_code_(postal_code),
+        city_(city)
     {
     }
+
+    friend istream& operator>>(istream& istr, address& address)
+    {
+        cout << "Strasse: ";
+        istr >> address.street_;
+        cout << "Hausnummer: ";
+        istr >> address.street_no_;
+        cout << "Postleitzahl: ";
+        istr >> address.postal_code_;
+        cout << "Ort: ";
+        istr >> address.city_;
+        return istr;
+    }
+
+    friend ostream& operator<<(ostream& ostr, const address& customer)
+    {
+        ostr << "Strasse: " << customer.street_ << endl;
+        ostr << "Hausnummer: " << customer.street_no_ << endl;
+        ostr << "Postleitzahl: " << customer.postal_code_ << endl;
+        ostr << "Ort: " << customer.city_ << endl;
+        return ostr;
+    }
+};
+
+class reservation final
+{
+private:
+    tm start_ = {};
+    tm end_ = {};
+    short motorcycle_ = -1; // => nothing reserved
+    string customer_name_;
+    string costumer_first_name_;
+public:
 };
 
 class customer final
@@ -28,20 +97,122 @@ private:
     unsigned short year_of_birth_ = 1900;
     string phone_no_;
     bool has_driving_license_ = false;
-    short reserved_motorcycle_ = -1; // => nothing reserved
 public:
-    customer(string&& name, string&& first_name,address&& address, unsigned short&& year_of_birth,  string&& phone_no, bool&& has_driving_license) : name_(name),
-                                                                                                                                         first_name_(first_name),
-                                                                                                                                         address_(address),
-                                                                                                                                         year_of_birth_(year_of_birth),
-                                                                                                                                         phone_no_(phone_no),
-                                                                                                                                         has_driving_license_(has_driving_license)
+    customer() = default;
+
+    customer(string&& name, string&& first_name, address&& address, unsigned short&& year_of_birth, string&& phone_no,
+             bool&& has_driving_license) : name_(name),
+                                           first_name_(first_name),
+                                           address_(address),
+                                           year_of_birth_(year_of_birth),
+                                           phone_no_(phone_no),
+                                           has_driving_license_(has_driving_license)
     {
-        
+    }
+
+    friend istream& operator>>(istream& istr, customer& customer)
+    {
+        cout << "Name: ";
+        istr >> customer.name_;
+        cout << "Vorname: ";
+        istr >> customer.first_name_;
+        cout << "Geburtsjahr: ";
+        istr >> customer.year_of_birth_;
+        istr >> customer.address_;
+        cout << "Telefonnumer: ";
+        istr >> customer.phone_no_;
+        customer.has_driving_license_ = ask_question("Fuehrerschein der Klasse A?");
+        return istr;
+    }
+
+    friend ostream& operator<<(ostream& ostr, const customer& customer)
+    {
+        ostr << "Name: " << customer.name_ << endl;
+        ostr << "Vorname: " << customer.first_name_ << endl;
+        ostr << "Geburtsjahr: " << customer.year_of_birth_ << endl;
+        ostr << customer.address_;
+        ostr << "Telefonnummer: " << customer.phone_no_ << endl;
+        ostr << "Fuehrerschein " << (customer.has_driving_license_ ? "" : "nicht ") << "vorhanden." << endl;
+        return ostr;
     }
 };
 
+
+void create_customer();
+void create_reservation();
+void rent_a_motorcycle();
+void export_reservations();
+
+list<customer> customers;
+list<reservation> reservations;
+
 int main()
 {
-    std::cout << "Hello World!\n";
+    while (true)
+    {
+        system("cls");
+        cout << "Motorradvermietung (" << reservations.size() << " Reservierungen; " << customers.size() << " Kunden)"
+            << endl << endl;
+        cout << "Bitte w\x84hlen Sie eine Option:" << endl;
+        cout << "1: Neuen Kunden anlegen" << endl;
+        cout << "2: Erstellen einer Reservierung" << endl;
+        cout << "3: Motorrad herausgeben" << endl;
+        cout << "4: Reservierungen exportieren" << endl;
+        cout << endl;
+        cout << "0: Programm beenden" << endl;
+        const auto input = ask_question<int>("Ihre Eingabe");
+
+        switch (input)
+        {
+        case 1:
+            create_customer();
+            break;
+        case 2:
+            create_reservation();
+            break;
+        case 3:
+            rent_a_motorcycle();
+            break;
+        case 4:
+            export_reservations();
+            break;
+        case 0:
+            return 0;
+        default:
+            cout << "Unerlaubte Eingabe" << endl;
+            system("pause");
+        }
+    }
+}
+
+void create_customer()
+{
+    while (true)
+    {
+        system("cls");
+        cout << "Neuen Kunden anlegen" << endl;
+        cout << "------------------------------------" << endl;
+
+        customer customer;
+        cin >> customer;
+        cout << endl << endl;
+        cout << customer;
+        if (ask_question("Angaben korrekt?"))
+        {
+            customers.push_back(customer);
+            return;
+        }
+    }
+}
+
+void create_reservation()
+{
+}
+
+void rent_a_motorcycle()
+{
+}
+
+void export_reservations()
+{
 }