diff --git a/fioer/flow/utils.py b/fioer/flow/utils.py
index 7734765..e6fc1c8 100644
--- a/fioer/flow/utils.py
+++ b/fioer/flow/utils.py
@@ -1,10 +1,27 @@
 from fioer.job import FioTask
 from typing import List
 
+
+
+def calc_test_slope(data: List[float]) -> float:
+    """
+    calculate the slope of the data
+    """
+    
+    
+    
+
+
+
+
+
+
 def check_tasks_convergence(tasks: List[FioTask], threshold: float = 0.01) -> bool:
     """
     check tests convergence: steady state or not
     """
     #TODO 
     
-    pass
\ No newline at end of file
+    pass
+
+