diff --git a/ReleaseNotes/release_notes.md b/ReleaseNotes/release_notes.md
index 2283f1b7..67201efb 100644
--- a/ReleaseNotes/release_notes.md
+++ b/ReleaseNotes/release_notes.md
@@ -9,7 +9,9 @@
   1. suppress `ostap.core.config.config_goodby` prints for non-interactive sessions
   1. add the most primitive splitter `ostap.utils.utils.splitter`
   1. modify `point-to-point-dissimilarity` GoF method: split into chubnks for large datasets, use parallel processing for permutations
-    
+  1. add keyword arguments to `WorkManager.iexecute` method
+  1. add an option to run parallel permutations using `WorkManager` parallelisation instead of `joblib`
+
 ## Backward incompatible
 
 ## Bug fixes
diff --git a/ostap/stats/gof_np.py b/ostap/stats/gof_np.py
index dcd5322c..c2eeb367 100644
--- a/ostap/stats/gof_np.py
+++ b/ostap/stats/gof_np.py
@@ -243,7 +243,7 @@ def __call__ ( self , N , silent = True ) :
 if jl : # =====================================================================
     # =========================================================================
     ## Run NN-permutations in parallel using joblib 
-    def jl_run ( self , NN , silent = True ) :
+    def joblib_run ( self , NN , silent = True ) :
         """ Run NN-permutations in parallel using joblib """
         nj    = 4 * numcpu () + 4
         lst   = splitter ( NN , nj )
@@ -260,11 +260,28 @@ def jl_run ( self , NN , silent = True ) :
         # 
         return counter 
     
-    PERMUTATOR.run = jl_run
+    PERMUTATOR.run = joblib_run
     # =========================================================================
 else : # ======================================================================
     # =========================================================================
-    PERMUTATOR.run = None
+    ## Run NN-permutations in parallel using WorkManager
+    def pp_run ( self , NN , silent = True ) :
+        """ Run NN-permutations in parallel using WorkManager"""
+        nj    = 4 * numcpu () + 4
+        lst   = splitter ( NN , nj )
+        ##
+        from ostap.parallel.parallel import WorkManager
+        manager = WorkManager ( silent = silent )
+        counter = EffCounter()
+        ## 
+        ## use the bare interface 
+        for result in manager.iexecute ( self , lst , progress = not silent  , njobs = nj ) :
+            counter += result 
+        # 
+        return counter 
+    
+    PERMUTATOR.run = pp_run
+    # =========================================================================
     
 # =============================================================================
 ## @class PPD