diff --git a/lib/vm/method_compiler/name_expression.rb b/lib/vm/method_compiler/name_expression.rb
index 83a50728..3be9d5c1 100644
--- a/lib/vm/method_compiler/name_expression.rb
+++ b/lib/vm/method_compiler/name_expression.rb
@@ -10,7 +10,7 @@ module Vm
         [:self , :space , :message].each do |special|
           return send(:"load_special_#{special}" , statement ) if name == special
         end
-        return load_argument(statement) if( @method.has_arg(name))
+        return load_argument(statement) if( @method.has_argument(name))
         load_local(statement)
       end
 
@@ -18,9 +18,9 @@ module Vm
 
       def load_argument(statement)
         name = statement.name
-        index = @method.has_arg(name)
+        index = @method.has_argument(name)
         named_list = use_reg :NamedList
-        ret = use_reg @method.argument_type(index)
+        ret = use_reg @method.arguments_type(index)
         #puts "For #{name} at #{index} got #{@method.arguments.inspect}"
         add_slot_to_reg("#{statement} load args" , :message , :arguments, named_list )
         add_slot_to_reg("#{statement} load #{name}" , named_list , index + 1, ret )
diff --git a/lib/vm/parfait/typed_method.rb b/lib/vm/parfait/typed_method.rb
index c553f425..12ba43d2 100644
--- a/lib/vm/parfait/typed_method.rb
+++ b/lib/vm/parfait/typed_method.rb
@@ -44,8 +44,8 @@ module Parfait
     end
 
     # determine whether this method has an argument by the name
-    def has_arg( name )
-      raise "has_arg #{name}.#{name.class}" unless name.is_a? Symbol
+    def has_argument( name )
+      raise "has_argument #{name}.#{name.class}" unless name.is_a? Symbol
       index = arguments.variable_index( name )
       index ? (index - 1) : index
     end
@@ -61,7 +61,7 @@ module Parfait
     def argument_name( index )
       arguments.names.get(index + 1)
     end
-    def argument_type( index )
+    def arguments_type( index )
       arguments.types.get(index + 1)
     end
 
diff --git a/test/vm/parfait/test_typed_method.rb b/test/vm/parfait/test_typed_method.rb
index e8ff97c9..24cb1b19 100644
--- a/test/vm/parfait/test_typed_method.rb
+++ b/test/vm/parfait/test_typed_method.rb
@@ -24,35 +24,35 @@ class TestMethod < MiniTest::Test
     assert_equal :bar , @method.argument_name(1)
   end
 
-  def test_has_arg
-    assert_equal 1 , @method.has_arg(:bar)
-    assert_equal 2 , @method.has_arg(:foo)
+  def test_has_argument
+    assert_equal 1 , @method.has_argument(:bar)
+    assert_equal 2 , @method.has_argument(:foo)
   end
 
   def test_add_arg
     @method.add_argument(:foo2 , :Object)
     assert_equal 3 , @method.arguments_length
     assert_equal :foo2 , @method.argument_name(3)
-    assert_equal :Object , @method.argument_type(3)
+    assert_equal :Object , @method.arguments_type(3)
   end
 
   def test_get_arg_name1
-    index = @method.has_arg(:bar)
+    index = @method.has_argument(:bar)
     assert_equal 1 , index
     assert_equal :bar , @method.argument_name(index)
   end
   def test_get_arg_type1
-    index = @method.has_arg(:bar)
-    assert_equal :Integer , @method.argument_type(index)
+    index = @method.has_argument(:bar)
+    assert_equal :Integer , @method.arguments_type(index)
   end
   def test_get_arg_name2
-    index = @method.has_arg(:foo)
+    index = @method.has_argument(:foo)
     assert_equal 2 , index
     assert_equal :foo , @method.argument_name(index)
   end
   def test_get_arg_type2
-    index = @method.has_arg(:foo)
-    assert_equal :Type , @method.argument_type(index)
+    index = @method.has_argument(:foo)
+    assert_equal :Type , @method.arguments_type(index)
   end
 
   def test_local1