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diff --git a/fuzzylite/src/term/SigmoidProduct.cpp b/fuzzylite/src/term/SigmoidProduct.cpp
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+++ b/fuzzylite/src/term/SigmoidProduct.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/term/SigmoidProduct.h"
+
+namespace fl {
+
+    SigmoidProduct::SigmoidProduct(const std::string& name,
+            scalar left, scalar rising,
+            scalar falling, scalar right, scalar height)
+    : Term(name, height), _left(left), _rising(rising), _falling(falling), _right(right) { }
+
+    SigmoidProduct::~SigmoidProduct() { }
+
+    std::string SigmoidProduct::className() const {
+        return "SigmoidProduct";
+    }
+
+    Complexity SigmoidProduct::complexity() const {
+        return Complexity().comparison(1).arithmetic(2 + 4 + 4).function(2);
+    }
+
+    scalar SigmoidProduct::membership(scalar x) const {
+        if (Op::isNaN(x)) return fl::nan;
+        const scalar a = 1.0 + std::exp(-_rising * (x - _left));
+        const scalar b = 1.0 + std::exp(-_falling * (x - _right));
+        return Term::_height * 1.0 / (a * b);
+    }
+
+    std::string SigmoidProduct::parameters() const {
+        return Op::join(4, " ", _left, _rising, _falling, _right) +
+                (not Op::isEq(getHeight(), 1.0) ? " " + Op::str(getHeight()) : "");
+    }
+
+    void SigmoidProduct::configure(const std::string& parameters) {
+        if (parameters.empty()) return;
+        std::vector<std::string> values = Op::split(parameters, " ");
+        std::size_t required = 4;
+        if (values.size() < required) {
+            std::ostringstream ex;
+            ex << "[configuration error] term <" << className() << ">"
+                    << " requires <" << required << "> parameters";
+            throw Exception(ex.str(), FL_AT);
+        }
+        setLeft(Op::toScalar(values.at(0)));
+        setRising(Op::toScalar(values.at(1)));
+        setFalling(Op::toScalar(values.at(2)));
+        setRight(Op::toScalar(values.at(3)));
+        if (values.size() > required)
+            setHeight(Op::toScalar(values.at(required)));
+
+    }
+
+    void SigmoidProduct::setRising(scalar risingSlope) {
+        this->_rising = risingSlope;
+    }
+
+    scalar SigmoidProduct::getRising() const {
+        return this->_rising;
+    }
+
+    void SigmoidProduct::setLeft(scalar leftInflection) {
+        this->_left = leftInflection;
+    }
+
+    scalar SigmoidProduct::getLeft() const {
+        return this->_left;
+    }
+
+    void SigmoidProduct::setRight(scalar rightInflection) {
+        this->_right = rightInflection;
+    }
+
+    scalar SigmoidProduct::getRight() const {
+        return this->_right;
+    }
+
+    void SigmoidProduct::setFalling(scalar fallingSlope) {
+        this->_falling = fallingSlope;
+    }
+
+    scalar SigmoidProduct::getFalling() const {
+        return this->_falling;
+    }
+
+    SigmoidProduct* SigmoidProduct::clone() const {
+        return new SigmoidProduct(*this);
+    }
+
+    Term* SigmoidProduct::constructor() {
+        return new SigmoidProduct;
+    }
+
+}