diff --git a/interface/ri_oper.py b/interface/ri_oper.py
index 4e15f00..9b7ddca 100644
--- a/interface/ri_oper.py
+++ b/interface/ri_oper.py
@@ -46,7 +46,7 @@ class Operation:
     return_value - shell script return value
     score        - an abstract value, for example score is 5,
     steps        - the subprocess of the number of runs
-    step         - the subprocess run one time
+    current_step         - the subprocess run one time
     total is 100, if this operations is completed, 5% work is done.
 
     and the following methods:
@@ -68,7 +68,7 @@ class Operation:
         self.script       = s
         self.score        = scr
         self.steps        = 1
-        self.step         = 0
+        self.current_step = 0
 
     def install(self):
         if display_operation:
@@ -84,8 +84,8 @@ class Operation:
             line = process.stdout.readline()
             if not line:
                 break
-            if line[0] == '@' and self.step < self.steps:
-                self.step += 1
+            if line[0] == '@' and self.current_step < self.steps:
+                self.current_step += 1
                 if display_sub_operation:
                     display_sub_operation(line[1:])
                 Rate.increase(float(self.score)/self.steps, max)