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diff --git a/fuzzylite/src/activation/First.cpp b/fuzzylite/src/activation/First.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/First.h"
+
+#include "fl/rule/RuleBlock.h"
+#include "fl/rule/Rule.h"
+#include "fl/Operation.h"
+
+namespace fl {
+
+    First::First(int numberOfRules, scalar threshold) : Activation(),
+    _numberOfRules(numberOfRules), _threshold(threshold) { }
+
+    First::~First() { }
+
+    std::string First::className() const {
+        return "First";
+    }
+
+    std::string First::parameters() const {
+        return Op::str(getNumberOfRules()) + " " + Op::str(getThreshold());
+    }
+
+    void First::configure(const std::string& parameters) {
+        if (parameters.empty()) return;
+        std::vector<std::string> values = Op::split(parameters, " ");
+        std::size_t required = 2;
+        if (values.size() < required) {
+            std::ostringstream ex;
+            ex << "[configuration error] activation <" << className() << ">"
+                    << " requires <" << required << "> parameters";
+            throw Exception(ex.str(), FL_AT);
+        }
+        setNumberOfRules((int) Op::toScalar(values.at(0)));
+        setThreshold(Op::toScalar(values.at(1)));
+    }
+
+    Complexity First::complexity(const RuleBlock* ruleBlock) const {
+        Complexity result;
+
+        const TNorm* conjunction = ruleBlock->getConjunction();
+        const SNorm* disjunction = ruleBlock->getDisjunction();
+        const TNorm* implication = ruleBlock->getImplication();
+
+        Complexity meanFiring;
+        for (std::size_t i = 0; i < ruleBlock->numberOfRules(); ++i) {
+            result.comparison(1 + 3);
+            const Rule* rule = ruleBlock->getRule(i);
+            result += rule->complexityOfActivation(conjunction, disjunction);
+            meanFiring += rule->complexityOfFiring(implication);
+        }
+        meanFiring.divide(scalar(ruleBlock->numberOfRules()));
+
+        result += meanFiring.multiply(getNumberOfRules());
+        result += Complexity().arithmetic(1).multiply(getNumberOfRules());
+        return result;
+    }
+
+    void First::activate(RuleBlock* ruleBlock) {
+        FL_DBG("Activation: " << className() << " " << parameters());
+        const TNorm* conjunction = ruleBlock->getConjunction();
+        const SNorm* disjunction = ruleBlock->getDisjunction();
+        const TNorm* implication = ruleBlock->getImplication();
+
+        int activated = 0;
+        for (std::vector<Rule*>::const_iterator it = ruleBlock->rules().begin();
+                it != ruleBlock->rules().end(); ++it) {
+            Rule* rule = (*it);
+            rule->deactivate();
+
+            if (rule->isLoaded()) {
+                scalar activationDegree = rule->activateWith(conjunction, disjunction);
+                if (activated < _numberOfRules
+                        and Op::isGt(activationDegree, 0.0)
+                        and Op::isGE(activationDegree, _threshold)) {
+                    rule->trigger(implication);
+                    ++activated;
+                }
+            }
+        }
+    }
+
+    void First::setNumberOfRules(int numberOfRules) {
+        this->_numberOfRules = numberOfRules;
+    }
+
+    int First::getNumberOfRules() const {
+        return this->_numberOfRules;
+    }
+
+    void First::setThreshold(scalar threshold) {
+        this->_threshold = threshold;
+    }
+
+    scalar First::getThreshold() const {
+        return this->_threshold;
+    }
+
+    First* First::clone() const {
+        return new First(*this);
+    }
+
+    Activation* First::constructor() {
+        return new First;
+    }
+
+}
+