diff --git a/vernier_parser/vernier_cli.py b/vernier_parser/vernier_cli.py
index 28da854..7b4d955 100644
--- a/vernier_parser/vernier_cli.py
+++ b/vernier_parser/vernier_cli.py
@@ -2,12 +2,49 @@
 A file for containing the vernier cli interface.
 """
 
+import argparse
+from vernier_parser.vernier_series import VernierSeries
+import os
+
+
+def dummy_function(num1: int, bool1: bool) -> None:
+
+    if bool1:
+        print(num1 * 1)
+    else:
+        print(num1 * 1)
+
 
 def main() -> None:
     """
     Vernier parser cli interface.
     """
-    print("Need to make a cli interface")
+    parser = argparse.ArgumentParser(
+        description="Parse Vernier run data and generate a summary CSV.",
+    )
+
+    parser.add_argument(
+        "run_path",
+        type=str,
+        help="Path to the Vernier run data directory or file.",
+    )
+
+    parser.add_argument(
+        "csv_path",
+        type=str,
+        help="Path to save the generated summary CSV.",
+    )
+
+    args = parser.parse_args()
+    vern_series = VernierSeries(args.run_path)
+    vern_series.make_summary_csv(args.csv_path)
+
+    assert os.path.exists(args.csv_path), \
+        "output csv does not exist, something has gone wrong"
+
+    # dummy code to show interesting issues
+    path = os.path.join(["home", "Rob"])
+    print(path)
 
 
 if __name__ == "__main__":
diff --git a/vernier_parser/vernier_series.py b/vernier_parser/vernier_series.py
index e92d56f..b587cd5 100644
--- a/vernier_parser/vernier_series.py
+++ b/vernier_parser/vernier_series.py
@@ -137,3 +137,16 @@ def _summarise_key(self, key: str) -> dict:
             }
 
         return results
+
+    def make_summary_csv(self, csv_output_path: str) -> None:
+        """
+        Method to make and save a summary csv for the vernier series.
+
+        Args:
+            csv_output_path (str): path for the output csv
+
+        Raises:
+            NotImplementedError: Need to write
+
+        """
+        raise NotImplementedError