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diff --git a/fuzzylite/src/activation/Proportional.cpp b/fuzzylite/src/activation/Proportional.cpp
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+++ b/fuzzylite/src/activation/Proportional.cpp
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+/*
+ fuzzylite (R), a fuzzy logic control library in C++.
+ Copyright (C) 2010-2017 FuzzyLite Limited. All rights reserved.
+ Author: Juan Rada-Vilela, Ph.D. <jcrada@fuzzylite.com>
+
+ This file is part of fuzzylite.
+
+ fuzzylite is free software: you can redistribute it and/or modify it under
+ the terms of the FuzzyLite License included with the software.
+
+ You should have received a copy of the FuzzyLite License along with
+ fuzzylite. If not, see <http://www.fuzzylite.com/license/>.
+
+ fuzzylite is a registered trademark of FuzzyLite Limited.
+ */
+
+#include "fl/activation/Proportional.h"
+
+#include "fl/rule/RuleBlock.h"
+#include "fl/rule/Rule.h"
+#include "fl/Operation.h"
+
+namespace fl {
+
+    Proportional::Proportional() : Activation() { }
+
+    Proportional::~Proportional() { }
+
+    std::string Proportional::className() const {
+        return "Proportional";
+    }
+
+    std::string Proportional::parameters() const {
+        return "";
+    }
+
+    void Proportional::configure(const std::string& parameters) {
+        FL_IUNUSED(parameters);
+    }
+
+    Complexity Proportional::complexity(const RuleBlock* ruleBlock) const {
+        Complexity result;
+        for (std::size_t i = 0; i < ruleBlock->numberOfRules(); ++i) {
+            result.comparison(1).arithmetic(1);
+            result += ruleBlock->getRule(i)->complexityOfActivation(
+                    ruleBlock->getConjunction(), ruleBlock->getDisjunction());
+        }
+
+        for (std::size_t i = 0; i < ruleBlock->numberOfRules(); ++i) {
+            result.arithmetic(1);
+            result += ruleBlock->getRule(i)->complexityOfFiring(ruleBlock->getImplication());
+        }
+        return result;
+    }
+
+    void Proportional::activate(RuleBlock* ruleBlock) {
+        FL_DBG("Activation: " << className() << " " << parameters());
+        const TNorm* conjunction = ruleBlock->getConjunction();
+        const SNorm* disjunction = ruleBlock->getDisjunction();
+        const TNorm* implication = ruleBlock->getImplication();
+
+        scalar sumActivationDegrees = 0.0;
+        std::vector<Rule*> rulesToActivate;
+        const std::size_t numberOfRules = ruleBlock->numberOfRules();
+        for (std::size_t i = 0; i < numberOfRules; ++i) {
+            Rule* rule = ruleBlock->getRule(i);
+            rule->deactivate();
+            if (rule->isLoaded()) {
+                scalar activationDegree = rule->activateWith(conjunction, disjunction);
+                rulesToActivate.push_back(rule);
+                sumActivationDegrees += activationDegree;
+            }
+        }
+
+        for (std::size_t i = 0; i < rulesToActivate.size(); ++i) {
+            Rule* rule = rulesToActivate.at(i);
+            scalar activationDegree = rule->getActivationDegree() / sumActivationDegrees;
+            rule->setActivationDegree(activationDegree);
+            rule->trigger(implication);
+        }
+    }
+
+    Proportional* Proportional::clone() const {
+        return new Proportional(*this);
+    }
+
+    Activation* Proportional::constructor() {
+        return new Proportional;
+    }
+
+}