diff --git a/lib/rubella.rb b/lib/rubella.rb
index 93b1304..5e7c84d 100644
--- a/lib/rubella.rb
+++ b/lib/rubella.rb
@@ -1,24 +1,27 @@
 module Rubella
 
   class Map
+    attr_reader :input
+    attr_reader :output
+    attr_reader :weighting
 
-    def initialize(input, output, weighting)
+    def initialize(input_name, output_name, weighting_name)
 
-      case input
+      @input = case input_name
         when "json" then
           self.input_json
         else
-          raise NotImplementedError, "Not supported input type "+input+" given"
+          raise NotImplementedError, "Not supported input type "+input_name+" given"
       end
 
-      case output
+      @output = case output_name
         when "image" then
           self.output_image
         else
-          raise NotImplementedError, "Not supported output type "+output+" given"
+          raise NotImplementedError, "Not supported output type "+output_name+" given"
       end
 
-      case weighting
+      @weighting = case weighting_name
         when "per_value" then
           self.weighting_per_value
         when "per_overall_load" then
@@ -26,29 +29,34 @@ module Rubella
         when "expotential" then
           self.weighting_expotential
         else
-          raise NotImplementedError, "Not supported weighting type "+weighting+" given"
+          raise NotImplementedError, "Not supported weighting type "+weighting_name+" given"
       end
-      
+
     end
 
     def input_json
       require "rubella/input/json"
+      Input::JSON
     end
 
     def output_image
       require "rubella/output/image"
+      Output::Image
     end
 
     def weighting_per_value
       require "rubella/weighting/per_value"
+      Weighting::PerValue
     end
 
     def weighting_per_overall_load
       require "rubella/weighting/per_overall_load"
+      Weighting::PerOverallLoad
     end
 
     def weighting_expotential
       require "rubella/weighting/expotential"
+      Weighting::Expotential
     end
 
   end
diff --git a/lib/rubella/output/image.rb b/lib/rubella/output/image.rb
index e69de29..aa09a4b 100644
--- a/lib/rubella/output/image.rb
+++ b/lib/rubella/output/image.rb
@@ -0,0 +1,8 @@
+module Rubella
+  module Output
+
+    class Image
+    end
+
+  end
+end
diff --git a/lib/rubella/weighting/exponential.rb b/lib/rubella/weighting/exponential.rb
index e69de29..ff8420b 100644
--- a/lib/rubella/weighting/exponential.rb
+++ b/lib/rubella/weighting/exponential.rb
@@ -0,0 +1,8 @@
+module Rubella
+  module Weighting
+
+    class Expotential
+    end
+
+  end
+end
diff --git a/lib/rubella/weighting/per_overall_load.rb b/lib/rubella/weighting/per_overall_load.rb
index e69de29..073cdf5 100644
--- a/lib/rubella/weighting/per_overall_load.rb
+++ b/lib/rubella/weighting/per_overall_load.rb
@@ -0,0 +1,8 @@
+module Rubella
+  module Weighting
+
+    class PerOverallLoad
+    end
+
+  end
+end
diff --git a/lib/rubella/weighting/per_value.rb b/lib/rubella/weighting/per_value.rb
index 5c24b35..bdd4e8c 100644
--- a/lib/rubella/weighting/per_value.rb
+++ b/lib/rubella/weighting/per_value.rb
@@ -1,5 +1,5 @@
 module Rubella
-  module Weigthing
+  module Weighting
 
     # Gets an input object and prepares the data for the output.
     #