diff --git a/app/controllers/base_configurations_controller.rb b/app/controllers/base_configurations_controller.rb
new file mode 100644
index 0000000..15d1968
--- /dev/null
+++ b/app/controllers/base_configurations_controller.rb
@@ -0,0 +1,37 @@
+include OwnershipAuthentication
+include MetricConfigurationsConcern
+
+class BaseConfigurationsController < ApplicationController
+
+	def new
+    update_metric_configuration(MetricConfiguration.new)
+    metric_configuration.configuration_id = params[:mezuro_configuration_id].to_i
+  end
+
+  def show
+    @reading_group = ReadingGroup.find(metric_configuration.reading_group_id)
+    @mezuro_ranges = metric_configuration.mezuro_ranges
+    metric_configuration.configuration_id = params[:mezuro_configuration_id].to_i
+  end
+
+  def create
+    update_metric_configuration(MetricConfiguration.new(metric_configuration_params))
+    metric_configuration.configuration_id = params[:mezuro_configuration_id].to_i
+  end
+
+  protected
+
+  def metric_configuration
+  	raise "SubclassResponsibility";
+	end
+
+  def update_metric_configuration (new_metric_configuration)
+  	raise "SubclassResponsibility";
+	end
+
+  # Never trust parameters from the scary internet, only allow the white list through.
+  # TODO: this should be refactored to the concern metric configuration
+  def metric_configuration_params
+    params[:metric_configuration]
+  end
+end
\ No newline at end of file
diff --git a/app/controllers/compound_metric_configurations_controller.rb b/app/controllers/compound_metric_configurations_controller.rb
index 128d51d..1ee3b18 100644
--- a/app/controllers/compound_metric_configurations_controller.rb
+++ b/app/controllers/compound_metric_configurations_controller.rb
@@ -1,33 +1,24 @@
 include OwnershipAuthentication
 include MetricConfigurationsConcern
 
-class CompoundMetricConfigurationsController < ApplicationController
+class CompoundMetricConfigurationsController < BaseConfigurationsController
   before_action :authenticate_user!, except: [:show, :index]
   before_action :mezuro_configuration_owner?, only: [:new, :create]
   before_action :metric_configuration_owner?, only: [:edit, :update]
   before_action :set_metric_configuration, only: [:show, :edit, :update]
   before_action :set_metric_configurations, only: [:new, :edit]
-  
-  # GET mezuro_configurations/1/compound_metric_configurations/new
-  def new
-    @compound_metric_configuration = MetricConfiguration.new
-    @compound_metric_configuration.configuration_id = params[:mezuro_configuration_id].to_i
-  end
 
   def create
-    @compound_metric_configuration = MetricConfiguration.new(metric_configuration_params)
-    @compound_metric_configuration.configuration_id = params[:mezuro_configuration_id].to_i
-    @compound_metric_configuration.metric.compound = true
+    super
+    metric_configuration.metric.compound = true
     respond_to do |format|
       create_and_redir(format)
     end
   end
 
   def show
-    @compound_metric_configuration = @metric_configuration
-    @reading_group = ReadingGroup.find(@compound_metric_configuration.reading_group_id)
-    @mezuro_ranges = @compound_metric_configuration.mezuro_ranges
-    @compound_metric_configuration.configuration_id = params[:mezuro_configuration_id].to_i
+    update_metric_configuration(@metric_configuration)
+    super
   end
 
   def edit
@@ -35,6 +26,16 @@ class CompoundMetricConfigurationsController < ApplicationController
     @compound_metric_configuration.configuration_id = params[:mezuro_configuration_id].to_i
   end
 
+  protected
+
+  def metric_configuration
+    @compound_metric_configuration;
+  end
+
+  def update_metric_configuration (new_metric_configuration)
+    @compound_metric_configuration = new_metric_configuration;
+  end
+
   private
 
   # Never trust parameters from the scary internet, only allow the white list through.
diff --git a/app/controllers/metric_configurations_controller.rb b/app/controllers/metric_configurations_controller.rb
index f6b2521..677e3ef 100644
--- a/app/controllers/metric_configurations_controller.rb
+++ b/app/controllers/metric_configurations_controller.rb
@@ -1,7 +1,7 @@
 include OwnershipAuthentication
 include MetricConfigurationsConcern
 
-class MetricConfigurationsController < ApplicationController
+class MetricConfigurationsController < BaseConfigurationsController
   before_action :authenticate_user!, except: [:show, :index]
   before_action :metric_configuration_owner?, only: [:edit, :update, :destroy]
   before_action :mezuro_configuration_owner?, only: [:new, :create, :choose_metric]
@@ -15,15 +15,13 @@ class MetricConfigurationsController < ApplicationController
   end
 
   def new
-    @metric_configuration = MetricConfiguration.new
-    @metric_configuration.configuration_id = params[:mezuro_configuration_id].to_i
-    @metric_configuration.base_tool_name = params[:base_tool_name]
-    @metric_configuration.metric = KalibroGatekeeperClient::Entities::BaseTool.find_by_name(params[:base_tool_name]).metric params[:metric_name]
+    super
+    metric_configuration.base_tool_name = params[:base_tool_name]
+    metric_configuration.metric = KalibroGatekeeperClient::Entities::BaseTool.find_by_name(params[:base_tool_name]).metric params[:metric_name]
   end
 
   def create
-    @metric_configuration = MetricConfiguration.new(metric_configuration_params)
-    @metric_configuration.configuration_id = params[:mezuro_configuration_id].to_i
+    super
     @metric_configuration.metric = KalibroGatekeeperClient::Entities::BaseTool.find_by_name(params[:base_tool_name]).metric params[:metric_name]
     @metric_configuration.base_tool_name = params[:base_tool_name]
     respond_to do |format|
@@ -31,12 +29,6 @@ class MetricConfigurationsController < ApplicationController
     end
   end
 
-  def show 
-    @reading_group = ReadingGroup.find(@metric_configuration.reading_group_id)
-    @mezuro_ranges = @metric_configuration.mezuro_ranges
-    @metric_configuration.configuration_id = params[:mezuro_configuration_id].to_i
-  end
-
   def edit
     #FIXME: set the configuration id just once!
     @mezuro_configuration_id = params[:mezuro_configuration_id]
@@ -63,14 +55,18 @@ class MetricConfigurationsController < ApplicationController
     end
   end
 
-  private
+  protected
 
-  # Never trust parameters from the scary internet, only allow the white list through.
-  # TODO: this should be refactored to the concern metric configuration
-  def metric_configuration_params
-    params[:metric_configuration]
+  def metric_configuration
+    @metric_configuration;
   end
 
+  def update_metric_configuration (new_metric_configuration)
+    @metric_configuration = new_metric_configuration;
+  end
+
+  private
+
   # Duplicated code on create and update actions extracted here
   def failed_action(format, destiny_action)
     @mezuro_configuration_id = params[:mezuro_configuration_id]
--
libgit2 0.21.2