diff --git a/aggregator.py b/aggregator.py
index 3498703..549a0d5 100644
--- a/aggregator.py
+++ b/aggregator.py
@@ -7,7 +7,7 @@ from mypool import MyPool
 from postprocessor import PostProcessor
 
 
-def _map_rule(rule, arg, overwrite, path, path_out, pp_params, run_num):
+def _map_aux(fun, path, path_out, pp_params, run_num, **kwargs):
     try:
         pp = PostProcessor(
             path + "/" + run_num[0], run_num[1], path_out + "/" + run_num[0], pp_params
@@ -15,35 +15,56 @@ def _map_rule(rule, arg, overwrite, path, path_out, pp_params, run_num):
     except Exception as e:
         print(e)
         raise
-    return pp.process(rule, arg, overwrite, overwrite)
+    return fun(pp, **kwargs)
+
+
+def _map_rule(pp, rule, arg, overwrite, overwrite_dep):
+    return pp.process(rule, arg, overwrite, overwrite_dep)
 
 
 class Aggregator:
-    def get_pp_list(self):
-        return [self.pp[run][num] for run in self.runs for num in self.nums[run]]
+    def get_pp_list(self, select=None):
 
-    def map(self, func):
-        return [func(pp) for pp in self.get_pp_list()]
-
-    def _not_self_dep(self, name, dep, dep_arg, overwrite, select):
         if select is not None:
             runs, nums = self.selector.select(**select)
         else:
             runs = self.runs
             nums = self.nums
+        return [self.pp[run][num] for run in runs for num in nums[run]]
 
-        run_num = [(run, num) for run in runs for num in nums[run]]
-        map_fn = partial(
-            _map_rule, dep, dep_arg, overwrite, self.path, self.path_out, self.pp_params
-        )
+    def map(self, func, select=None, num_process=None, **kwargs):
 
-        if self.pp_params.process.num_process > 1:
-            pool = MyPool(processes=self.pp_params.process.num_process)
+        pp_list = self.get_pp_list(select)
+
+        if num_process is None:
+            num_process = self.pp_params.process.num_process
+
+        if num_process == 1:
+            result = [func(pp, **kwargs) for pp in pp_list]
+        else:
+            run_num = [(pp.run, pp.num) for pp in pp_list]
+            map_fn = partial(
+                _map_aux, func, self.path, self.path_out, self.pp_params, **kwargs
+            )
+
+            pool = MyPool(processes=num_process)
             result = pool.map(map_fn, run_num)
             pool.close()
             pool.join()
-        else:
-            result = map(map_fn, run_num)
+
+        return result
+
+    def _not_self_dep(self, name, dep, dep_arg, overwrite, select):
+
+        result = self.map(
+            _map_rule,
+            select,
+            None,
+            rule=dep,
+            arg=dep_arg,
+            overwrite=overwrite,
+            overwrite_dep=overwrite,
+        )
 
         if np.any([res is not None for res in result]):
             self.just_done.append(dep)