diff --git a/README.md b/README.md
index 0c090a9..d5ba68e 100644
--- a/README.md
+++ b/README.md
@@ -46,9 +46,9 @@ def alert_cbck(alert_code, alert_msg):
         alert_msg = 'no msg'
     print(f'{alert_msg} (code {alert_code})')
 c = CDCStream(
+    alert_callback=alert_cbck,
     summary_extractor=dilca_workflow,
     summary_extractor_args={'nominal_cols': 'all'},
-    alert_callback=alert_cbck,
     factor_warn=2.0,
     factor_change=3.0,
     factor_std_extr_forg=0,
diff --git a/cdcstream/cdcstream.py b/cdcstream/cdcstream.py
index 5f2218f..60d5141 100644
--- a/cdcstream/cdcstream.py
+++ b/cdcstream/cdcstream.py
@@ -24,6 +24,8 @@
 import numpy as np
 import pandas as pd
 
+from cdcstream.dilca_wrapper import dilca_workflow
+
 
 class DriftDetector:
     ALERT_NONE = 0
@@ -42,8 +44,9 @@ class UnsupervisedDriftDetector(DriftDetector):
 class CDCStream(UnsupervisedDriftDetector):
 
     def __init__(self,
-                 summary_extractor: Callable, summary_extractor_args: dict,
                  alert_callback: Callable,
+                 summary_extractor: Callable=dilca_workflow,
+                 summary_extractor_args: dict={'nominal_cols': 'all'},
                  factor_warn: float=2.0,
                  factor_change: float=3.0,
                  factor_std_extr_forg: Union[float, int] =0,
@@ -63,13 +66,15 @@ def __init__(self,
         }
 
         Args:
-            summary_extractor (Callable): Function for extracting a summary value from a batch of
-                data. Must accept as first parameter: data; as named parameter: supervised.
-            summary_extractor_args (dict): Other named parameters (apart from first parameter data
-                and named parameter supervised) to pass to summary_extractor.
             alert_callback (Callable): Function being called after each batch with an alert code of
                 ALERT_NONE, ALERT_WARN, ALERT_CHANGE. Must accept as arguments: alert_code: int,
                 alert_msg: str.
+            summary_extractor (Callable, optional): Function for extracting a summary value from a
+                batch of data. Must accept as first parameter: data; as named parameter:
+                supervised. Defaults to cdcstream.dilca_wrapper.dilca_workflow.
+            summary_extractor_args (dict, optional): Other named parameters (apart from first
+                parameter data and named parameter supervised) to pass to summary_extractor.
+                Defaults to {'nominal_cols': 'all'}.
             factor_warn (float, optional): Parameter for Chebychev's Inequality for issuing a drift
                 warning. Must be smaller than or equal to factor_change. Defaults to 2.0.
             factor_change (float, optional): Parameter for Chebychev's Inequality for signaling a
@@ -300,7 +305,6 @@ def log(self) -> pd.DataFrame:
 
 
 if __name__ == '__main__':
-    from cdcstream.dilca_wrapper import dilca_workflow
     from cdcstream import tools
 
 
@@ -314,9 +318,9 @@ def alert_cbck(alert_code, alert_msg):
             alert_msg = 'no msg'
         print(f'{alert_msg} (code {alert_code})')
     c = CDCStream(
+        alert_callback=alert_cbck,
         summary_extractor=dilca_workflow,
         summary_extractor_args={'nominal_cols': 'all'},
-        alert_callback=alert_cbck,
         factor_warn=2.0,
         factor_change=3.0,
         factor_std_extr_forg=0,