diff --git a/src/NoPELib/expansionsLib.py b/src/NoPELib/expansionsLib.py
index 726d244..62d64e6 100644
--- a/src/NoPELib/expansionsLib.py
+++ b/src/NoPELib/expansionsLib.py
@@ -137,10 +137,23 @@ class serialShocker(Expansion):
             a float within the range [0.0, 1.0] that defines the intensity
         """
         vibrateInstead, duration, intensity = action
-        if vibrateInstead:
-            self.shocker.vibrate(duration=duration, intensity=intensity)
-        else:
-            self.shocker.shock(duration=duration, intensity=intensity)
+        callFunc = self.shocker.vibrate if vibrateInstead else self.shocker.shock
+        # Try to execute the step
+        try:
+            callFunc(duration=duration, intensity=intensity)
+            error = None
+            done = True
+        except Exception as e:
+            error = e
+            done = False
+        # Return additionnal info
+        step_info = {
+            "expansionID": self._ID,
+            "showOnScreen": None,
+            "error": error,
+            "done": done
+        }
+        return step_info 
 
     def close(self):
         pass
@@ -168,10 +181,24 @@ class simplest(Expansion):
         """
         vibrateInstead, duration, intensity = action
         values = f"duration={duration}, intensity={intensity}"
-        if vibrateInstead:
-            print(f"Vibrate with {values}")
-        else:
-            print(f"Shock with {values}")
+        interact_type = "Vibrate" if vibrateInstead else "Shock"
+        # Try to execute the step
+        try:
+            message = f"{interact_type} with {values}"
+            error = None
+            done = True
+        except Exception as e:
+            message = None
+            error = e
+            done = False
+        # Return additionnal info
+        step_info = {
+            "expansionID": self._ID,
+            "showOnScreen": message,
+            "error": error,
+            "done": done
+        }
+        return step_info 
 
     def close(self):
         print("Closing")