diff --git a/src/Agents/Agent.cs b/src/Agents/Agent.cs
index 8138848..dca77e7 100644
--- a/src/Agents/Agent.cs
+++ b/src/Agents/Agent.cs
@@ -3,6 +3,7 @@ namespace Polonium.Agents;
 
 public abstract class Agent
 {
+    protected static int ComputerCount = 0;
 
     public string Name { get; init; }
 
@@ -11,15 +12,27 @@ public abstract class Agent
         Name = name;
         PoloniumRegistry.Instance.Agents[name] = this;
     }
+
+    public int Level { get; private set; }
+    public abstract int MaxLevel { get; }
+
+    public virtual void LevelUp()
+    {
+        if(Level < MaxLevel)
+            Level++;
+    }
+
 }
 
-public abstract class Agent<TAgent, TAgentDecisionMaker, TAgentKnowledge> : Agent
-    where TAgent : Agent<TAgent, TAgentDecisionMaker, TAgentKnowledge>
-    where TAgentDecisionMaker : AgentDecisionMaker<TAgent, TAgentDecisionMaker, TAgentKnowledge>, new()
-    where TAgentKnowledge : AgentKnowledge<TAgent, TAgentDecisionMaker, TAgentKnowledge>, new()
+public abstract class Agent<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction> : Agent
+    where TAgent : Agent<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
+    where TAgentDecisionMaker : AgentDecisionMaker<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
+    where TAgentKnowledge : AgentKnowledge<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
+    where TAgentAction : AgentAction<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
 {
 
-    private static int ComputerCount = 0;
+    public Dictionary<string, TAgentAction> Actions { get; } = new();
+
     public TAgentDecisionMaker DecisionMaker { get; init; }
     public TAgentKnowledge Knowledge { get; init; }
 
diff --git a/src/Agents/AgentAction.cs b/src/Agents/AgentAction.cs
new file mode 100644
index 0000000..328832e
--- /dev/null
+++ b/src/Agents/AgentAction.cs
@@ -0,0 +1,60 @@
+using Polonium.Interfaces;
+
+namespace Polonium.Agents;
+
+public abstract class AgentAction
+{
+}
+
+public abstract class AgentAction<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction> : AgentAction, ITimeConsumer
+    where TAgent : Agent<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
+    where TAgentDecisionMaker : AgentDecisionMaker<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
+    where TAgentKnowledge : AgentKnowledge<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
+    where TAgentAction : AgentAction<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
+{
+
+    public int Level { get; private set; }
+
+    public abstract int MaxLevel { get; }
+
+    public virtual void LevelUp()
+    {
+        if(Level < MaxLevel)
+            Level++;
+    }
+
+    public AgentAction(double coolDown)
+    {
+        CoolDown = coolDown;
+        PoloniumRegistry.Instance.TimeConsumers.Add(this);
+    }
+
+    public abstract class ActionParameter
+    {
+    }
+
+    public virtual bool Execute(ActionParameter parameter)
+    {
+        if (Disabled || CoolDown > 0)
+            return false;
+        CoolDownTime = CoolDown;
+        return true;
+    }
+
+    
+    private double CoolDownTime { get; set; }
+    public bool Disabled { get; set; }
+
+    private double CoolDown { get; }
+
+    public void Process(double delta)
+    {
+        
+        if (Disabled || CoolDownTime <= 0)
+            return;
+        CoolDownTime -= delta;
+        if (CoolDownTime <= 0)
+            CoolDownTime = 0;
+        
+    }
+}
diff --git a/src/Agents/AgentDecisionMaker.cs b/src/Agents/AgentDecisionMaker.cs
index c5d28bd..4c20980 100644
--- a/src/Agents/AgentDecisionMaker.cs
+++ b/src/Agents/AgentDecisionMaker.cs
@@ -1,28 +1,17 @@
 namespace Polonium.Agents;
 
-public abstract class AgentDecisionMaker<TAgent, TAgentDecisionMaker, TAgentKnowledge>
-    where TAgent : Agent<TAgent, TAgentDecisionMaker, TAgentKnowledge>
-    where TAgentDecisionMaker : AgentDecisionMaker<TAgent, TAgentDecisionMaker, TAgentKnowledge>, new()
-    where TAgentKnowledge : AgentKnowledge<TAgent, TAgentDecisionMaker, TAgentKnowledge>, new()
+public abstract class AgentDecisionMaker<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>(DecisionMakerType type)
+    where TAgent : Agent<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
+    where TAgentDecisionMaker : AgentDecisionMaker<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
+    where TAgentKnowledge : AgentKnowledge<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
+    where TAgentAction : AgentAction<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
 {
     
-    public enum DecisionMakerType
-    {
-        None = 0,
-        Player = 1,
-        Computer = 2,
-        Global = 3,
-    }
-    
-    public DecisionMakerType Type { get; init; }
-    
-    public AgentDecisionMaker()
-    {
-        Type = DecisionMakerType.Computer;
-    }
 
-    public AgentDecisionMaker(DecisionMakerType type)
+    
+    public DecisionMakerType Type { get; init; } = type;
+
+    public AgentDecisionMaker() : this(DecisionMakerType.Computer)
     {
-        Type = type;
     }
 }
\ No newline at end of file
diff --git a/src/Agents/AgentKnowledge.cs b/src/Agents/AgentKnowledge.cs
index 8f986b1..4b07676 100644
--- a/src/Agents/AgentKnowledge.cs
+++ b/src/Agents/AgentKnowledge.cs
@@ -1,9 +1,14 @@
 namespace Polonium.Agents;
 
-public abstract class AgentKnowledge<TAgent, TAgentDecisionMaker, TAgentKnowledge>
-    where TAgent : Agent<TAgent, TAgentDecisionMaker, TAgentKnowledge>
-    where TAgentDecisionMaker : AgentDecisionMaker<TAgent, TAgentDecisionMaker, TAgentKnowledge>, new()
-    where TAgentKnowledge : AgentKnowledge<TAgent, TAgentDecisionMaker, TAgentKnowledge>, new()
+public abstract class AgentKnowledge
+{
+}
+
+public abstract class AgentKnowledge<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction> : AgentKnowledge
+    where TAgent : Agent<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
+    where TAgentDecisionMaker : AgentDecisionMaker<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
+    where TAgentKnowledge : AgentKnowledge<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
+    where TAgentAction : AgentAction<TAgent, TAgentDecisionMaker, TAgentKnowledge, TAgentAction>, new()
 {
     public AgentKnowledge()
     {
diff --git a/src/Agents/DecisionMakerType.cs b/src/Agents/DecisionMakerType.cs
new file mode 100644
index 0000000..f721983
--- /dev/null
+++ b/src/Agents/DecisionMakerType.cs
@@ -0,0 +1,9 @@
+namespace Polonium.Agents;
+
+public enum DecisionMakerType
+{
+    None = 0,
+    Player = 1,
+    Computer = 2,
+    Global = 3,
+}
\ No newline at end of file
diff --git a/src/Interfaces/ITimeConsumer.cs b/src/Interfaces/ITimeConsumer.cs
new file mode 100644
index 0000000..4c5a3c9
--- /dev/null
+++ b/src/Interfaces/ITimeConsumer.cs
@@ -0,0 +1,6 @@
+namespace Polonium.Interfaces;
+
+public interface ITimeConsumer
+{
+    public void Process(double time);
+}
\ No newline at end of file
diff --git a/src/PoloniumRegistry.cs b/src/PoloniumRegistry.cs
index 5b775dc..9cfa8d2 100644
--- a/src/PoloniumRegistry.cs
+++ b/src/PoloniumRegistry.cs
@@ -1,5 +1,6 @@
 using Godot;
 using Polonium.Agents;
+using Polonium.Interfaces;
 using Polonium.Resources;
 using Polonium.Scenes;
 
@@ -18,4 +19,8 @@ public class PoloniumRegistry
         DirAccess.MakeDirAbsolute("user://saves");
     }
     public Dictionary<string, Agent> Agents { get; set; } = new();
+    
+    public HashSet<ITimeConsumer> TimeConsumers { get; set; } = new();
+    public bool Paused { get; set; }
+
 }
\ No newline at end of file
diff --git a/src/Scenes/RootScene.cs b/src/Scenes/RootScene.cs
index 58f8f94..947ba8f 100644
--- a/src/Scenes/RootScene.cs
+++ b/src/Scenes/RootScene.cs
@@ -1,5 +1,6 @@
 using Godot;
 using Polonium.Attributes;
+using Polonium.Interfaces;
 
 namespace Polonium.Scenes;
 [ProxyNode]
@@ -31,4 +32,13 @@ public partial class RootScene : Node2D
         Enter();
         base._EnterTree();
     }
-}
\ No newline at end of file
+
+    public override void _Process(double delta)
+    {
+        if(!PoloniumRegistry.Instance.Paused)
+            foreach (ITimeConsumer tc in PoloniumRegistry.Instance.TimeConsumers)
+                tc.Process(delta);
+        base._Process(delta);
+    }
+}
+