diff --git a/.gitignore b/.gitignore
index 1905dcb..d29eef7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,5 @@ __pycache__
 dist/
 
 *.swp
+
+*.kdev4
diff --git a/README.md b/README.md
index 8396aaa..9cd3b0b 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,7 @@ The experiment description in `example.experiment` roughly translates to: Perfor
 ###### `example.py`
 
 ```python3
-def run(instance):
+def run(instance, save_callback, state):
     # do some stuff on "instance"
 ```
 
@@ -53,7 +53,7 @@ The `run` function is where the magic happens. For every file in our batch the
 
 Now that we have specified everything, we can start executing our experiment.
 
-```
+```python3
 >>> import alma.experiment
 
 >>> dispatcher = alma.experiment.load("example.experiment")
@@ -62,13 +62,13 @@ Now that we have specified everything, we can start executing our experiment.
 
 The line `dispatcher.start()` starts the concurrent non blocking execution of our experiment. This means the dispatcher stays responsive and we can pause/stop the execution at any given time.
 
-```
+```python3
 >>> dispatcher.stop()
 ```
 
 During the execution the `dispatcher` continuously keeps track of which files he still needs to call `run(...)` on and how many iterations he has left. He does so by saving the current state of the execution in a file. Loading an experiment (`alma.experiment.load(...)`) the framework first looks for such a save file and if one exists, the execution will pick up at the point we've called `dispatcher.stop()`. To pick up the experiment we can perform:
 
-```
+```python3
 >>> dispatcher = alma.experiment.load("example.experiment")
 >>> dispatcher.start()
 ```
@@ -79,6 +79,6 @@ During the execution the `dispatcher` continuously keeps track of which files he
 Fist clone the repository and then switch into it's root directory and call
 
 ```bash
-$> pip install -e .
+$ pip install -e .
 ```
 This will locally install the **pyalma** framework on your system.
diff --git a/alma/batch.py b/alma/batch.py
index 23bc65f..505af96 100644
--- a/alma/batch.py
+++ b/alma/batch.py
@@ -6,7 +6,7 @@ def load(batch_file):
 
     with open(batch_file, "r") as bfile:
         batch_obj = json.loads(bfile.read())
-    
+
     batch_obj["base_path"] = batch_file.parent
 
     return __load_batch_obj(batch_obj)
diff --git a/alma/experiment.py b/alma/experiment.py
index 6e79c67..402eae8 100644
--- a/alma/experiment.py
+++ b/alma/experiment.py
@@ -32,7 +32,7 @@ def load(exp_file):
             num_workers = os.cpu_count()
         else:
             num_workers = int(exp_obj["workers"])
-
+    
     return Dispatcher(exp_mod, exp_plan, num_workers)
 
 class Dispatcher (threading.Thread):
@@ -75,6 +75,7 @@ class Dispatcher (threading.Thread):
             worker.join()
 
         self.__done()
+    
 
     def stop(self):
         self.__stop_called.set()
@@ -102,11 +103,19 @@ class Worker (multiprocessing.Process):
         instance = self.__exp_plan.next()
         
         while instance != None:
-            self.__exp_mod.run(instance)
+            instance_state = self.__exp_plan.load_instance_state(instance)
+            
+            self.__exp_mod.run(instance,
+                               lambda data: self.__exp_plan.save_instance_state(
+                                   instance,
+                                   data
+                                ), 
+                               instance_state)
+            
             self.__exp_plan.done_with(instance)
 
             instance = self.__exp_plan.next()
-
+        
     def terminate(self):
         self.__exp_plan.delete()
         multiprocessing.Process.terminate(self)
diff --git a/alma/plan.py b/alma/plan.py
index f55fd14..4cbfccf 100644
--- a/alma/plan.py
+++ b/alma/plan.py
@@ -12,6 +12,8 @@ class Plan:
         self.file = None
         self.pending_instances = []
         self.assigned_instances = []
+        self.instance_states = {}
+        
         self.__lock = threading.Lock() if lock == None else lock
 
         if experiment:
@@ -82,9 +84,14 @@ class Plan:
 
             if "iterations_left" in content:
                 self.iterations_left = content["iterations_left"]
+                
+            if "instance_states" in content:
+                self.instance_states = content["instance_states"]
+                
             
     def __is_finished(self):
         return False if self.file.is_file() else True
+        
 
     def next(self):
 
@@ -111,6 +118,9 @@ class Plan:
 
             if instance in self.assigned_instances:
                 self.assigned_instances.remove(instance)
+                
+            if instance in self.instance_states:
+                self.instance_states.pop(instance)
 
             self.__update_file()
 
@@ -120,7 +130,9 @@ class Plan:
         all_done = True
 
         content["iterations_left"] = self.iterations_left
-
+        
+        content["instance_states"] = self.instance_states
+        
         if len(self.assigned_instances) > 0:
             content["assigned"] = self.assigned_instances
             all_done = False
@@ -154,6 +166,25 @@ class Plan:
 
         with open(self.file, "w") as pfile:
             pfile.write(json.dumps(content))
+            
+    def save_instance_state(self, instance, data):
+        
+        with self.__lock:
+            self.__load()
+            
+            self.instance_states[instance] = data
+            
+            self.__update_file()
+            
+    def load_instance_state(self, instance):
+        
+        with self.__lock:
+            self.__load()
+            
+            if instance in self.instance_states:
+                return self.instance_states[instance]
+            else:
+                return ""
     
     def delete(self):
         with self.__lock:
diff --git a/docs/run_module.md b/docs/run_module.md
new file mode 100644
index 0000000..82f480b
--- /dev/null
+++ b/docs/run_module.md
@@ -0,0 +1,2 @@
+# Run Module
+