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diff --git a/include/HyperNeat/Population.hpp b/include/HyperNeat/Population.hpp
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+#ifndef __HYPERNEAT_POPULATION_HPP__
+#define __HYPERNEAT_POPULATION_HPP__
+
+#include <HyperNeat/Organism.hpp>
+#include <HyperNeat/Innovation.hpp>
+#include <HyperNeat/Utils/Random.hpp>
+#include <HyperNeat/Utils/Vector.hpp>
+#include <HyperNeat/Utils/Pointer.hpp>
+#include <HyperNeat/NeuralNetPrms.hpp>
+#include <HyperNeat/NoveltyMetric.hpp>
+#include <HyperNeat/Utils/Vector2D.hpp>
+#include <HyperNeat/Utils/Function.hpp>
+#include <HyperNeat/PopulationPrms.hpp>
+
+namespace hyperneat
+{
+    class NeuralNet;
+    class NoveltyMetricPrms;
+
+    class Population
+    {
+    public:
+        void create(const PopulationPrms& popPrms);
+        void create(const PopulationPrms& popPrms, const NeuralNetPrms& nnPrms);
+        void create(const PopulationPrms& popPrms, const NeuralNetPrms& nnPrms, const NoveltyMetricPrms& nmPrms);
+        void shutdown(bool resetOrganisms = false, bool archiveOrganisms = false);
+        ~Population();
+
+        void setMinimumLifetime(size_t lifetime);
+
+        const PopulationPrms& getPopulationPrms() const;
+        const NeuralNetPrms& getNeuralNetPrms() const;
+        bool hasNeuralNets() const;
+        const Vector<Organism>& getAllOrganisms() const;
+        const Vector2D<Organism*>& getSpecies() const;
+
+        Organism& getOrganism(size_t i);
+        Organism& getChampion();
+        const Vector<Organism*>& getSpecie(size_t i) const;
+
+        void lock();
+        void unlock();
+        bool isLocked() const;
+
+        void lockOrganism(size_t i);
+        void unlockOrganism(size_t i);
+        bool isOrganismLocked(size_t i) const;
+        bool isAnyOrganismLocked() const;
+        size_t getLockedOrganisms() const;
+
+        void freezeOrganism(size_t i);
+        void unfreezeOrganism(size_t i);
+        bool isOrganismFrozen(size_t i) const;
+        bool isAnyOrganismFrozen() const;
+        size_t getFrozenOrganisms() const;
+
+        bool isOrganismBeingGenerated(size_t i) const;
+        bool isAnyOrganismBeingGenerated() const;
+        size_t getOrganismsBeingGenerated() const;
+
+        size_t getReadyOrganisms() const;
+
+        const Vector<Innovation>& getInnovations() const;
+        size_t getInnovationsCount() const;
+        size_t getBasicInnovationsCount() const;
+        Organism* getLastReplacement();
+        Organism* getLastMother();
+        Organism* getLastFather();
+        size_t getReplacements() const;
+        bool recentReplacement() const;
+        double getDistanceThreshold() const;
+        size_t getOldOrganisms() const;
+        size_t getMinimumOldOrganisms() const;
+        double getAverageFitness() const;
+        double getAverageOldFitness() const;
+
+        void setNoveltyMetric(const NoveltyMetricPrms& prms);
+        void clearNoveltyMetric();
+        bool isNoveltyMetricSet() const;
+        const NoveltyMetric& getNoveltyMetric() const;
+
+        size_t getUpdates() const;
+
+        double& fitnessOf(size_t i);
+        bool update(Function<void(void)> beforeReplacement = []() {}, Function<void(void)> afterReplacement = []() {});
+
+    private:
+        void generateAllNeuralNets();
+
+        void replaceOrganism();
+        Organism* killPoorOrganism();
+        Vector<Organism*>* chooseParentSpecie();
+
+        void breedAsexually(Genome& child, const Genome& mother);
+        void breedSexually(Genome& child, const Genome& mother, const Genome& father);
+        bool mutateNodesAndLinks(Genome& child);
+
+        void assignToSpecie(Organism& org);
+        void organizeSpecies();
+        double computeDistance(const Genome& g1, const Genome& g2) const;
+
+        size_t getRandSeed() const;
+        size_t getRandSize(size_t low, size_t hi);
+        double getRandReal(double low, double hi);
+        double getRandWeight();
+        double getWeightDeviation();
+        NodeType getRandNodeType();
+        bool getChance(double ratio);
+
+        PopulationPrms         _prms;
+        Pointer<NeuralNetPrms> _nnPrms;
+        Vector2D<Organism*>    _species;
+        Vector<Organism>       _allOrganisms;
+
+        bool           _populationLock          = false;
+        size_t         _lockedOrganisms         = 0;
+        size_t         _frozenOrganisms         = 0;
+        Atomic<size_t> _organismsBeingGenerated = {0};
+
+        Vector<Innovation> _innovations;
+        size_t             _basicInnovs = 0;
+
+        Organism* _lastReplacement   = nullptr;
+        Organism* _lastMother        = nullptr;
+        Organism* _lastFather        = nullptr;
+        size_t    _replacements      = 0;
+        bool      _recentReplacement = false;
+        double    _distanceThreshold = 0.0;
+        size_t    _oldOrganisms      = 0;
+        size_t    _minOldOrganisms   = 0;
+
+        Pointer<NoveltyMetric> _noveltyMetric;
+
+        size_t _updates = 0;
+
+        RandGen  _randGen;
+        IntDist  _nodeTypeSelector = IntDist(0, NODE_TYPES_COUNT - 1);
+        RealDist _weightSelector   = RealDist(0.0, 1.0);
+        BellDist _weightDeviator;
+        RealDist _chanceSelector;
+
+        friend class LoadFile;
+        friend class Organism;
+        friend class NoveltyMetric;
+    };
+}
+
+#endif