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ImplementANewVRPEvaluator

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 After this tutorial you will be able to implement your own VRP variants that only require extending the {{{VRPEvaluator}}}. You will also have a basic understanding of the concepts and architecture concerning the {{{VRPEvaluator}}} and related components.
+== The Pollution-Routing Problem ==
+To demonstrate the procedure of extending a {{{VRPEvaluator}}}, the implementation of the [http://www.sciencedirect.com/science/article/pii/S019126151100018X Pollution-Routing Problem] is demonstrated. The ''Pollution-Routing Problem (PRP)'' considers the environmental impact of transport logistic by taking the energy consumption of a vehicle into account. Depending on the PRP model, different factors like vehicle mass, speed and environment related factors are considered.
+In this tutorial the PRP is based on the ''Capacitated Vehicle Routing Problem (CVRP)''. To keep the tutorial as simple as possible only the current mass of a vehicle is considered. The current mass of a vehicle is computable by its current position in a tour. Therefore no additional model data is required and the implementation of the PRP is possible by only extending the {{{VRPEvaluator}}}.