diff --git a/include/rosa/agent/DistanceMetrics.hpp b/include/rosa/agent/DistanceMetrics.hpp
index 8b11679..64de3d8 100644
--- a/include/rosa/agent/DistanceMetrics.hpp
+++ b/include/rosa/agent/DistanceMetrics.hpp
@@ -1,139 +1,136 @@
 //===-- rosa/agent/DistanceMetrics.hpp ---------------------*- C++ -*-===//
 //
 //                                 The RoSA Framework
 //
 // Distributed under the terms and conditions of the Boost Software License 1.0.
 // See accompanying file LICENSE.
 //
 // If you did not receive a copy of the license file, see
 // http://www.boost.org/LICENSE_1_0.txt.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file rosa/agent/DistanceMetrics.hpp
 ///
 /// \author Benedikt Tutzer (benedikt.tutzer@tuwien.ac.at)
 ///
 /// \date 2020
 ///
 /// \brief Definition of *DistanceMetrics* *functionality*.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef ROSA_AGENT_DISTANCEMETRICS_HPP
 #define ROSA_AGENT_DISTANCEMETRICS_HPP
 
 #include "rosa/agent/Abstraction.hpp"
 #include "rosa/agent/Functionality.h"
 
 #include "rosa/support/debug.hpp"
 
 
 namespace rosa {
 namespace agent {
 
 /// Implements \c rosa::agent::Abstraction as the absolute difference between
 /// two values
 ///
 /// \note This implementation is supposed to be used to represent a difference-metric
 /// function from an arithmetic domain to an arithmetic range. This is enforced
 /// statically.
 ///
 /// \tparam D type of the input values
 /// \tparam R type of the difference
 template <typename D, typename R>
 class AbsoluteDistance : public Abstraction<std::pair<D, D>, R> {
   // Make sure the actual type arguments are matching our expectations.
   STATIC_ASSERT((std::is_arithmetic<D>::value), "abstracting not arithmetic");
   STATIC_ASSERT((std::is_arithmetic<R>::value),
                 "abstracting not to arithmetic");
 
 public:
   /// Creates an instance by Initializing the underlying \c Abstraction.
   AbsoluteDistance(void) : Abstraction<std::pair<D, D>, R>(0) { }
 
   /// Destroys \p this object.
   ~AbsoluteDistance(void) = default;
 
   /// Checks wether the Abstraction evaluates to default at the given position
   ///
   /// \param V the value at which to check if the function falls back to it's
   /// default value.
   ///
   /// \return false if the value falls into a defined range and the Abstraction
   /// defined for that range does not fall back to it's default value.
   bool isDefaultAt(const std::pair<D, D> &V) const noexcept override {
     (void)(V);
     return false;
   }
 
   /// Calculates the distance-metric for the given value. If this is the first
   /// value, the Default-Value is returned
   ///
   /// \param V value to abstract
   ///
   /// \return the absolute distanct
   R operator()(const std::pair<D, D> &V) const noexcept override {
     return V.first - V.second;
   }
 };
 
 /// Implements \c rosa::agent::Abstraction as the relative difference between
 /// two values
 ///
 /// \note This implementation is supposed to be used to represent a difference-metric
 /// function from an arithmetic domain to an arithmetic range. This is enforced
 /// statically.
 ///
 /// \tparam D type of the input values
 /// \tparam R type of the difference
 template <typename D, typename R>
 class RelativeDistance : public Abstraction<std::pair<D, D>, R> {
   // Make sure the actual type arguments are matching our expectations.
   STATIC_ASSERT((std::is_arithmetic<D>::value), "abstracting not arithmetic");
   STATIC_ASSERT((std::is_arithmetic<R>::value),
                 "abstracting not to arithmetic");
 
 public:
   /// Creates an instance by Initializing the underlying \c Abstraction.
   RelativeDistance(void) : Abstraction<std::pair<D, D>, R>(0) { }
 
   /// Destroys \p this object.
   ~RelativeDistance(void) = default;
 
   /// Checks wether the Abstraction evaluates to default at the given position
   ///
   /// \param V the value at which to check if the function falls back to it's
   /// default value.
   ///
   /// \return false if the value falls into a defined range and the Abstraction
   /// defined for that range does not fall back to it's default value.
   bool isDefaultAt(const std::pair<D, D> &V) const noexcept override {
     (void)(V);
     return false;
   }
 
   /// Calculates the distance-metric for the given value. If this is the first
   /// value, the Default-Value is returned
   ///
   /// \param V value to abstract
   ///
   /// \return the absolute distanct
   R operator()(const std::pair<D, D> &V) const noexcept override {
     R Dist = ((R)V.second) - V.first;
     if (Dist == 0) {
         return 0;
     } else {
         Dist = Dist / V.first;
-        if (Dist < 0) {
-            return -Dist;
-        }
     }
     return Dist;
   }
 };
 
 } // End namespace agent
 } // End namespace rosa
 
 #endif // ROSA_AGENT_DISTANCEMETRICS_HPP