diff --git a/DecisionSystem/CentralisedDecision/commander.py b/DecisionSystem/CentralisedDecision/commander.py
index f97f0b4..7df9b01 100644
--- a/DecisionSystem/CentralisedDecision/commander.py
+++ b/DecisionSystem/CentralisedDecision/commander.py
@@ -7,9 +7,9 @@ class Commander:
 
     # Stores voters that connect to maintain a majority.
     # Voters who do not vote in latest round are removed.
-    connectedVoters = {}
-    votes = []
-    taking_votes = False
+    _connectedVoters = []
+    _votes = []
+    _taking_votes = False
 
     def __init__(self, timeout = 60):
         '''
@@ -47,7 +47,7 @@ class Commander:
 
         return max_vote
 
-    def get_votes():
+    def get_votes(self):
         message = {"type": "reqVote"}
         message_packed = umsgpack.packb(message)
         # Publish a message that votes are needed.
@@ -64,19 +64,21 @@ class Commander:
 
     def on_message(self, client, userdata, message):
         messageDict = umsgpack.unpackb()
-
-
         if "type" in messageDict.keys:
+            # Need to consider that a malicious message may have a type with incorrect subtypes. 
             if messageDict["type"] == "connect":
                 # Voter just connected/reconnnected.
-                pass
+                if not messageDict["client"] in self._connectedVoters:
+                    self._connectedVoters.append(messageDict["client"])
             elif messageDict["type"] == "vote":
                 # Voter is sending in their vote.
-                if messageDict[""]
-
+                # Only add vote to list if the client has not already voted. 
+                pass
+            elif messageDict["type"] == "disconnected":
+                self._connectedVoters.remove(messageDict["type"])
         else:
             # Not a message we should be using.
-            NotImplementedError
+            pass
 
-    def on_connect(client, userdata, flags, rc):
+    def on_connect(self, client, userdata, flags, rc):
         self.client.subscribe("swarm1/commander")
\ No newline at end of file