diff --git a/client_test.py b/client_test.py
index ae8157a..6025d4c 100644
--- a/client_test.py
+++ b/client_test.py
@@ -46,17 +46,27 @@ class Client():
         self.name = name
         self.surname = surname
         self.client_num = client_num
-        self.room = room
+        self.room = None
         self.period = period
-        self.key_num = key_num
-        self.bookings = bookings
-        self.status = status
+        self.key_num = 0
+        self.bookings = 0
+        self.status = False
 
         # Automatic status adjustment
         if len(self.bookings) >= 4:
             self.status = True
         Client.clients += 1
-    
+
+    def check_in(self, room, key_num):
+        room_list[reference.index(room)].occupy(surname, self.period)
+        num_ = "key_" + str(key_num) + ".hand_out_key(" + str(key_num) + "," + "'" + str(surname) + "')"
+        try:
+            exec(num_)
+            self.key_num = key_num
+        except:
+            ("Schlüssel mit Daten nicht gefunden.")        
+            
+
     def change_room(self, surname, new_room, key_num = 0): # Room add period 
         room_list[reference.index(self.room)].free()
         room_list[reference.index(new_room)].occupy(surname, self.period)