diff --git a/methods/common/additionality.py b/methods/common/additionality.py
index aa29335..e3cfd1e 100644
--- a/methods/common/additionality.py
+++ b/methods/common/additionality.py
@@ -1,7 +1,7 @@
 import glob
 import os
 import logging
-from typing import Dict, Any, List
+from typing import Dict, Any, List, Tuple
 
 import numpy as np # type: ignore
 import pandas as pd # type: ignore
@@ -85,7 +85,7 @@ def generate_additionality(
     density: np.ndarray,
     matches_directory: str,
     expected_number_of_iterations: int,
-) -> Dict[int, float]:
+) -> Tuple[Dict[int, float], List[bool]]:
     """Calculate the additionality (or leakage) of a project from the counterfactual pair matchings
     alongside the carbon density values and some project specific metadata."""
     logging.info("Project area: %.2fmsq", project_area_msq)
@@ -220,6 +220,20 @@ def generate_additionality(
     for year, values in treatment_data.items():
         p_tot[year] = np.average(values)
 
+
+    # testing stoping criteria
+    final_p = treatment_data[end_year]
+    final_c = scvt[end_year]
+    additionality = [p - c for p, c in zip(final_p, final_c)]
+    cv = 0.05
+    df = np.array([x + 1 for x in range(len(additionality))])
+
+    a_mu = np.cumsum(additionality) / df
+    variance = np.sum(np.power((additionality - a_mu), 2)) / (df - 1)
+    stderr = np.sqrt(variance) / np.sqrt(df)
+    d = np.abs(cv * a_mu)
+    stopping_criteria = stderr / d
+
     if partials_dir is not None:
         figure, axis = plt.subplots(1, 3)
         figure.set_figheight(10)
@@ -312,5 +326,5 @@ def generate_additionality(
     for year, value in p_tot.items():
         result[year] = value - c_tot[year]
 
-    return result
+    return result, stopping_criteria
     
\ No newline at end of file
diff --git a/methods/outputs/calculate_additionality.py b/methods/outputs/calculate_additionality.py
index ea0a037..03cd6a5 100644
--- a/methods/outputs/calculate_additionality.py
+++ b/methods/outputs/calculate_additionality.py
@@ -51,6 +51,13 @@
         dest="matches",
         help="Directory containing the parquet files of the matches.",
     )
+    parser.add_argument(
+        "--stopping",
+        type=str,
+        required=True,
+        dest="stopping_csv",
+        help="The destination stopping criteria path.",
+    )
     parser.add_argument(
         "--output",
         type=str,
@@ -81,7 +88,7 @@
     project_gpd = gpd.read_file(args.project_boundary_file)
     project_area_msq = area_for_geometry(project_gpd)
 
-    additionality = generate_additionality(
+    additionality, stopping_criteria = generate_additionality(
         project_area_msq,
         args.project_start,
         args.evaluation_year,
@@ -95,3 +102,9 @@
         writer.writerow(["year", "additionality"])
         for year, value in additionality.items():
             writer.writerow([year, value])
+
+    with open(args.stopping_csv, "w", encoding="utf-8") as file:
+        writer = csv.writer(file)
+        writer.writerow(["iteration", "stable"])
+        for index, value in enumerate(stopping_criteria):
+            writer.writerow([index + 1, value])