diff --git a/src/Calc/Calc.php b/src/Calc/Calc.php
index edb9d8c..c325a2d 100644
--- a/src/Calc/Calc.php
+++ b/src/Calc/Calc.php
@@ -14,6 +14,7 @@ use PSC\Library\Calc\General\Type\Edge;
 use PSC\Library\Calc\General\Type\EdgeCollection;
 use PSC\Library\Calc\General\Type\EdgeCollectionContainer;
 use PSC\Library\Calc\Option\Type\Base;
+use PSC\Library\Calc\Option\Type\Checkbox;
 use PSC\Library\Calc\Option\Type\PaperDbSelect;
 use PSC\Library\Calc\Option\Type\Select;
 use PSC\Library\Calc\Tests\Mock\Paper;
@@ -51,7 +52,7 @@ class Calc
         /** @var Base $option */
         foreach($this->article->getOptions() as $option) {
 
-            if($option instanceof Select) {
+            if($option instanceof Select || $option instanceof Checkbox) {
                 /** @var Select\Opt $opt */
                 foreach($option->getOptions() as $opt) {
                     if($opt->isValid() && $opt->isSelected()) {
@@ -132,6 +133,20 @@ class Calc
 
                             $this->engine->setVariable('price', $gesamt);
                         }
+                        if ($formel != "" && $option->getId() != 'weight' && $option->isAjaxExport() && !$option->isDisplayOnly() && $option->isAmount()) {
+                            $p = 0;
+                            $formel = str_replace("tonumber", '$this->toNumber', $formel);
+                            eval('@$p = ' . $formel . ';');
+
+                            $this->engine->addAjaxVariable($option->getId(), $p);
+                        }
+                        if ($formel != "" && $option->getId() != 'weight' && !$option->isAjaxExport() && $option->isDisplayOnly() && $option->isAmount()) {
+                            $p = 0;
+                            $formel = str_replace("tonumber", '$this->toNumber', $formel);
+                            eval('@$p = ' . $formel . ';');
+
+                            $this->engine->addDisplayVariable($option->getId(), $p);
+                        }
                         if(!$option->isAmount()) {
                             $p = 0;
                             $formel = str_replace("tonumber", '$this->toNumber', $formel);
diff --git a/src/Calc/CalcValues.php b/src/Calc/CalcValues.php
index 6b362c9..35decf1 100644
--- a/src/Calc/CalcValues.php
+++ b/src/Calc/CalcValues.php
@@ -15,6 +15,7 @@ use PSC\Library\Calc\General\Type\Edge;
 use PSC\Library\Calc\General\Type\EdgeCollection;
 use PSC\Library\Calc\General\Type\EdgeCollectionContainer;
 use PSC\Library\Calc\Option\Type\Base;
+use PSC\Library\Calc\Option\Type\Checkbox;
 use PSC\Library\Calc\Option\Type\PaperDbSelect;
 use PSC\Library\Calc\Option\Type\Select;
 use PSC\Library\Calc\Tests\Mock\Paper;
@@ -53,7 +54,7 @@ class CalcValues
         /** @var Base $option */
         foreach ($this->article->getOptions() as $option) {
 
-            if ($option instanceof Select) {
+            if ($option instanceof Select || $option instanceof Checkbox) {
                 /** @var Select\Opt $opt */
                 foreach ($option->getOptions() as $opt) {
                     if ($opt->isValid() && $opt->isSelected()) {
diff --git a/src/Calc/Valid.php b/src/Calc/Valid.php
index 942268f..96c584e 100644
--- a/src/Calc/Valid.php
+++ b/src/Calc/Valid.php
@@ -7,6 +7,7 @@ use PSC\Library\Calc\General\Type\Edge;
 use PSC\Library\Calc\General\Type\EdgeCollection;
 use PSC\Library\Calc\General\Type\EdgeCollectionContainer;
 use PSC\Library\Calc\Option\Type\Base;
+use PSC\Library\Calc\Option\Type\Checkbox;
 use PSC\Library\Calc\Option\Type\Select;
 
 class Valid
@@ -37,7 +38,7 @@ class Valid
         /** @var Base $option */
         foreach($this->article->getOptions() as $option) {
 
-            if($option instanceof Select) {
+            if($option instanceof Select|| $option instanceof Checkbox) {
 
                 $valid = false;
 
@@ -70,10 +71,19 @@ class Valid
                         }
                     }
 
-                    if($this->engine->getVariables()[$option->getId()] == $opt->getId()) {
-                        $opt->setIsSelected(true);
-                    }else{
-                        $opt->setIsSelected(false);
+                    if($option instanceof Checkbox) {
+                        if (in_array($opt->getId(), $this->engine->getVariables()[$option->getId()])) {
+                            $opt->setIsSelected(true);
+                        } else {
+                            $opt->setIsSelected(false);
+                        }
+
+                    }else {
+                        if ($this->engine->getVariables()[$option->getId()] == $opt->getId()) {
+                            $opt->setIsSelected(true);
+                        } else {
+                            $opt->setIsSelected(false);
+                        }
                     }
 
                     if($opt->isValid() && !$valid) {
diff --git a/src/Engine.php b/src/Engine.php
index b2c8255..b9cfe1f 100644
--- a/src/Engine.php
+++ b/src/Engine.php
@@ -6,6 +6,7 @@ use PSC\Library\Calc\Calc\Calc;
 use PSC\Library\Calc\Calc\CalcValues;
 use PSC\Library\Calc\Calc\Valid;
 use PSC\Library\Calc\Option\Type\Base;
+use PSC\Library\Calc\Option\Type\Checkbox;
 use PSC\Library\Calc\Option\Type\PaperDbSelect;
 use PSC\Library\Calc\Option\Type\Select\Opt;
 use PSC\Library\Calc\Option\Type\Text;
@@ -37,6 +38,12 @@ class Engine
     /** @var array */
     protected $calcVariables = array();
 
+    /** @var array */
+    protected $ajaxVariables = array();
+
+    /** @var array */
+    protected $displayVariables = array();
+
     /** @var float */
     protected $price = 0;
 
@@ -230,7 +237,11 @@ class Engine
             $option->setSavedCalcValues($this->savedCalcValues);
 
             if(!isset($this->variables[$option->getId()]) && $option->getDefault() !== null && !$option instanceof Text) {
-                $this->variables[$option->getId()] = $option->getDefault();
+                if($option instanceof Checkbox) {
+                    $this->variables[$option->getId()] = explode(",", $option->getDefault());
+                }else{
+                    $this->variables[$option->getId()] = $option->getDefault();
+                }
             }
 
             if(isset($this->variables[$option->getId()])) {
@@ -412,4 +423,46 @@ class Engine
     {
         $this->savedCalcValues = $values;
     }
+
+    /**
+     * @return array
+     */
+    public function getAjaxVariables()
+    {
+        return $this->ajaxVariables;
+    }
+
+    /**
+     * @param array $ajaxVariables
+     */
+    public function setAjaxVariables($ajaxVariables)
+    {
+        $this->ajaxVariables = $ajaxVariables;
+    }
+
+    public function addAjaxVariable($key, $value)
+    {
+        $this->ajaxVariables[$key] = $value;
+    }
+
+    /**
+     * @return array
+     */
+    public function getDisplayVariables()
+    {
+        return $this->displayVariables;
+    }
+
+    /**
+     * @param array $displayVariables
+     */
+    public function setDisplayVariables($displayVariables)
+    {
+        $this->displayVariables = $displayVariables;
+    }
+
+    public function addDisplayVariable($key, $value)
+    {
+        $this->displayVariables[$key] = $value;
+    }
 }
\ No newline at end of file
diff --git a/src/General/Type/Edge.php b/src/General/Type/Edge.php
index 10e3584..6dd8390 100644
--- a/src/General/Type/Edge.php
+++ b/src/General/Type/Edge.php
@@ -359,6 +359,9 @@ class Edge
                     (preg_match("/^([0-9]+)-$/", trim($val), $regs) && $value >= $regs[1]))) {
                     return true;
                 }
+                if(is_array($value) && in_array($val, $value)) {
+                    return true;
+                }
             }
         }
 
diff --git a/src/Option/Parser.php b/src/Option/Parser.php
index 8206efa..a157207 100644
--- a/src/Option/Parser.php
+++ b/src/Option/Parser.php
@@ -1,6 +1,7 @@
 <?php
 namespace PSC\Library\Calc\Option;
 
+use PSC\Library\Calc\Option\Parser\Checkbox;
 use PSC\Library\Calc\Option\Parser\Hidden;
 use PSC\Library\Calc\Option\Parser\Input;
 use PSC\Library\Calc\Option\Parser\Radio;
@@ -34,6 +35,9 @@ class Parser
             case 'radio':
                 $obj = new Radio($node);
                 break;
+            case 'checkbox':
+                $obj = new Checkbox($node);
+                break;
             case 'text':
                 $obj = new Text($node);
                 break;
diff --git a/src/Option/Parser/Checkbox.php b/src/Option/Parser/Checkbox.php
new file mode 100644
index 0000000..e2134b7
--- /dev/null
+++ b/src/Option/Parser/Checkbox.php
@@ -0,0 +1,48 @@
+<?php
+namespace PSC\Library\Calc\Option\Parser;
+
+use Doctrine\Common\Persistence\ObjectRepository;
+use PSC\Library\Calc\General\Parser\EdgeCollectionContainer;
+use PSC\Library\Calc\Option\Parser\Checkbox\Opt;
+use PSC\Library\Calc\PaperContainer;
+use PSC\Library\Calc\Tests\Mock\Paper;
+
+class Checkbox extends Base
+{
+
+    protected $element;
+
+    /** @var \SimpleXMLElement $node */
+    protected $node;
+
+    public function __construct(\SimpleXMLElement $node)
+    {
+
+        $this->element = new \PSC\Library\Calc\Option\Type\Checkbox();
+
+        parent::__construct($node);
+    }
+
+    public function parse()
+    {
+        parent::parse();
+
+        if(isset($this->node->grenzen) && $this->node->grenzen->children()) {
+            $edgeCollectionContainerParser = new EdgeCollectionContainer($this->node->grenzen);
+            $this->element->setEdgesCollectionContainer($edgeCollectionContainerParser->parse());
+        }
+
+        $this->parseModeNormal();
+
+        return $this->element;
+    }
+
+    private function parseModeNormal()
+    {
+        foreach ($this->node->opt as $opt) {
+            $optParser = new Opt($opt);
+            $this->element->addOption($optParser->parse());
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/src/Option/Parser/Checkbox/Opt.php b/src/Option/Parser/Checkbox/Opt.php
new file mode 100644
index 0000000..822fec3
--- /dev/null
+++ b/src/Option/Parser/Checkbox/Opt.php
@@ -0,0 +1,30 @@
+<?php
+namespace PSC\Library\Calc\Option\Parser\Checkbox;
+
+use PSC\Library\Calc\General\Parser\EdgeCollectionContainer;
+use PSC\Library\Calc\Option\Parser\Base;
+
+class Opt
+{
+    protected $element;
+
+    public function __construct(\SimpleXMLElement $node)
+    {
+        $this->element = new \PSC\Library\Calc\Option\Type\Checkbox\Opt();
+        $this->node = $node;
+    }
+
+    public function parse()
+    {
+        $this->element->setId((string)$this->node['id']);
+        $this->element->setLabel((string)$this->node['name']);
+
+        if($this->node->children()) {
+            $edgeCollectionContainerParser = new EdgeCollectionContainer($this->node);
+            $this->element->setEdgesCollectionContainer($edgeCollectionContainerParser->parse());
+        }
+
+        return $this->element;
+    }
+
+}
\ No newline at end of file
diff --git a/src/Option/Type/Checkbox.php b/src/Option/Type/Checkbox.php
new file mode 100644
index 0000000..2f2754b
--- /dev/null
+++ b/src/Option/Type/Checkbox.php
@@ -0,0 +1,49 @@
+<?php
+namespace PSC\Library\Calc\Option\Type;
+
+use PSC\Library\Calc\Option\Type\Select\Opt;
+
+class Checkbox extends Base
+{
+
+    static public $type = 'checkbox';
+
+    /** @var \ArrayIterator $options */
+    protected $options;
+
+    public function __construct()
+    {
+        parent::__construct();
+        $this->options = new \ArrayIterator();
+    }
+
+    public function addOption($option)
+    {
+        $this->options->append($option);
+    }
+
+    /**
+     * Verarbeitet das Value
+     */
+    public function processValue()
+    {
+
+    }
+
+    /**
+     * @return \ArrayIterator
+     */
+    public function getOptions()
+    {
+        return $this->options;
+    }
+
+    public function getSelectedOptions()
+    {
+        /** @var Opt $opt */
+        foreach($this->getOptions() as $opt) {
+            if($opt->isSelected()) return $opt;
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/src/Option/Type/Checkbox/Opt.php b/src/Option/Type/Checkbox/Opt.php
new file mode 100644
index 0000000..f8d7306
--- /dev/null
+++ b/src/Option/Type/Checkbox/Opt.php
@@ -0,0 +1,112 @@
+<?php
+namespace PSC\Library\Calc\Option\Type\Checkbox;
+
+use PSC\Library\Calc\General\Type\EdgeCollectionContainer;
+use PSC\Library\Calc\Option\Type\Base;
+
+class Opt
+{
+    /** @var string $id */
+    protected $id;
+
+    /** @var string $label */
+    protected $label;
+
+    /** @var EdgeCollectionContainer */
+    protected $edgesCollectionContainer;
+
+    /** @var bool */
+    protected $isValid = true;
+
+    /** @var bool */
+    protected $isSelected = false;
+
+    /**
+     * Opt constructor.
+     */
+    public function __construct()
+    {
+        $this->edgesCollectionContainer = new EdgeCollectionContainer();
+    }
+
+
+    /**
+     * @return string
+     */
+    public function getId()
+    {
+        return $this->id;
+    }
+
+    /**
+     * @param string $id
+     */
+    public function setId($id)
+    {
+        $this->id = $id;
+    }
+
+    /**
+     * @return string
+     */
+    public function getLabel()
+    {
+        return $this->label;
+    }
+
+    /**
+     * @param string $label
+     */
+    public function setLabel($label)
+    {
+        $this->label = $label;
+    }
+
+    /**
+     * @return EdgeCollectionContainer
+     */
+    public function getEdgesCollectionContainer()
+    {
+        return $this->edgesCollectionContainer;
+    }
+
+    /**
+     * @param EdgeCollectionContainer $edgesCollectionContainer
+     */
+    public function setEdgesCollectionContainer($edgesCollectionContainer)
+    {
+        $this->edgesCollectionContainer = $edgesCollectionContainer;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isValid()
+    {
+        return $this->isValid;
+    }
+
+    /**
+     * @param bool $isValid
+     */
+    public function setIsValid($isValid)
+    {
+        $this->isValid = $isValid;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isSelected()
+    {
+        return $this->isSelected;
+    }
+
+    /**
+     * @param bool $isSelected
+     */
+    public function setIsSelected($isSelected)
+    {
+        $this->isSelected = $isSelected;
+    }
+}
\ No newline at end of file
diff --git a/tests/Complex/SixTest.php b/tests/Complex/SixTest.php
new file mode 100644
index 0000000..43407aa
--- /dev/null
+++ b/tests/Complex/SixTest.php
@@ -0,0 +1,54 @@
+<?php
+namespace PSC\Library\Calc\Tests\Complex;
+
+use PSC\Library\Calc\Article;
+use PSC\Library\Calc\Engine;
+use PSC\Library\Calc\PaperContainer;
+use PSC\Library\Calc\Tests\Mock\PaperRepostory;
+
+class SixTest extends \PHPUnit_Framework_TestCase
+{
+
+    /** @var Engine */
+    protected $engine = null;
+
+    public function setUp()
+    {
+        $repository = new PaperRepostory();
+
+        $paperContainer = new PaperContainer();
+        $paperContainer->parse(simplexml_load_string(file_get_contents(__DIR__ . '/../TestFiles/Complex2/papierContainer.xml')));
+
+        $this->engine = new Engine();
+        $this->engine->setPaperContainer($paperContainer);
+        $this->engine->setPaperRepository($repository);
+        $this->engine->setFormulas(file_get_contents(__DIR__.'/../TestFiles/Complex2/formels.txt'));
+        $this->engine->setParameters(file_get_contents(__DIR__.'/../TestFiles/Complex2/parameters.txt'));
+
+        $this->engine->loadString(file_get_contents(__DIR__ . '/../TestFiles/Complex2/6.xml'));
+
+    }
+
+    public function tearDown()
+    {
+        $this->engine = null;
+    }
+
+    public function testIfArticleCountIsCorrect()
+    {
+        $this->assertEquals(1, $this->engine->getArticles()->Count());
+    }
+
+    public function testIfSelectedOptionsCorrect()
+    {
+        $this->engine->getPrice();
+        $this->assertEquals(37500 , $this->engine->getPrice());
+    }
+
+    public function testIfCalcCorrect()
+    {
+        $this->engine->setVariable('size', ['a3q','a4q']);
+        $this->engine->getPrice();
+        $this->assertEquals(42000 , $this->engine->getPrice());
+    }
+}
\ No newline at end of file
diff --git a/tests/Customer/G/CalcTest.php b/tests/Customer/G/CalcTest.php
index dd8f77d..b656652 100644
--- a/tests/Customer/G/CalcTest.php
+++ b/tests/Customer/G/CalcTest.php
@@ -39,4 +39,16 @@ class CalcTest extends \PHPUnit_Framework_TestCase
     {
         $this->assertEquals(10.49 , $this->engine->getPrice());
     }
+
+    public function testIfDisplayValues()
+    {
+        $this->assertEquals(10.49 , $this->engine->getPrice());
+        $this->assertCount(1 , $this->engine->getDisplayVariables());
+    }
+
+    public function testIfAjaxValues()
+    {
+        $this->assertEquals(10.49 , $this->engine->getPrice());
+        $this->assertCount(1 , $this->engine->getDisplayVariables());
+    }
 }
\ No newline at end of file
diff --git a/tests/Customer/G/calc.xml b/tests/Customer/G/calc.xml
index 3e06b62..2a54a34 100644
--- a/tests/Customer/G/calc.xml
+++ b/tests/Customer/G/calc.xml
@@ -39,7 +39,14 @@
         <!-- Lieferzeit Gesamt DISPLAY  -->
         <option id="lieferzeit_gesamt_display" name="lieferzeit_gesamt_display" type="Hidden" default="1" displayOnly="1">
             <auflage>
-                <grenze formel="5">-1</grenze>
+                <grenze formel="5">1-</grenze>
+            </auflage>
+        </option>
+
+        <!-- Lieferzeit Gesamt DISPLAY  -->
+        <option id="lieferzeit_gesamt_ajax" name="lieferzeit_gesamt_display" type="Hidden" default="1" exportAjax="1">
+            <auflage>
+                <grenze formel="5">1-</grenze>
             </auflage>
         </option>
 
diff --git a/tests/Parse/Option/CheckboxTest.php b/tests/Parse/Option/CheckboxTest.php
new file mode 100644
index 0000000..2660bea
--- /dev/null
+++ b/tests/Parse/Option/CheckboxTest.php
@@ -0,0 +1,23 @@
+<?php
+namespace PSC\Library\Calc\Tests\Option\Type;
+
+use PSC\Library\Calc\Option\Parser;
+use PSC\Library\Calc\Option\Type\Checkbox;
+use PSC\Library\Calc\Option\Type\Input;
+use PSC\Library\Calc\PaperContainer\Container;
+
+class CheckboxTest extends \PHPUnit_Framework_TestCase
+{
+    public function testIfCorrectType()
+    {
+        $parser = new Parser();
+        /** @var Parser\Checkbox $obj */
+        $obj = $parser->getOptByType(simplexml_load_string(file_get_contents(__DIR__ . '/../../TestFiles/Option/checkbox.xml')));
+
+        /** @var Checkbox $element */
+        $element = $obj->parse();
+
+        $this->assertInstanceOf('PSC\Library\Calc\Option\Type\Checkbox', $element);
+    }
+
+}
\ No newline at end of file
diff --git a/tests/TestFiles/Complex2/6.xml b/tests/TestFiles/Complex2/6.xml
new file mode 100644
index 0000000..20468bc
--- /dev/null
+++ b/tests/TestFiles/Complex2/6.xml
@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="utf-8"?>
+<kalkulation>
+    <artikel>
+        <name>TEST Checkbox</name>
+        <kommentar/>
+        <uploads>
+            <upload id="inhalt" name="Druckdaten" description="Bitte laden sie eine PDF für den Druck hoch"/>
+        </uploads>
+
+        <!-- Beginn der Eingabemaske -->
+
+        <option id="auflage" name="Auflage" type="Select" default="1500">
+            <opt id="500" name="500 Exemplare"></opt>
+            <opt id="750" name="750 Exemplare"></opt>
+            <opt id="1000" name="1.000 Exemplare"></opt>
+            <opt id="1500" name="1.500 Exemplare"></opt>
+            <opt id="2000" name="2.000 Exemplare"></opt>
+            <opt id="3000" name="3.000 Exemplare"></opt>
+            <opt id="5000" name="5.000 Exemplare"></opt>
+            <opt id="7500" name="7.500 Exemplare"></opt>
+            <opt id="10000" name="10.000 Exemplare"></opt>
+            <opt id="12500" name="12.500 Exemplare"></opt>
+            <opt id="15000" name="15.000 Exemplare"></opt>
+            <opt id="20000" name="20.000 Exemplare"></opt>
+            <opt id="30000" name="30.000 Exemplare"></opt>
+            <opt id="40000" name="40.000 Exemplare"></opt>
+            <opt id="50000" name="50.000 Exemplare"></opt>
+            <opt id="100000" name="100.000 Exemplare"></opt>
+        </option>
+
+        <option id="size" name="Wählen Sie eine Größe" type="Checkbox" width="3" default="a4h,a4q" require="true">
+            <opt id="a5h" name="DIN A5 Hochformat (210x148mm)"></opt>
+            <opt id="a5q" name="DIN A5 Querformat (148x210mm)"></opt>
+            <opt id="a4h" name="DIN A4 Hochformat (297 x 210 mm)"></opt>
+            <opt id="a4q" name="DIN A4 Querformat (210x297mm)"></opt>
+            <opt id="a3h" name="DIN A3 Hochformat (420x297mm)"></opt>
+            <opt id="a3q" name="DIN A3 Querformat (297x420mm)"></opt>
+        </option>
+
+
+        <option id="calc" name="Calc" type="Hidden">
+            <size>
+                <grenze formel="$Vauflage$V*10">a5h</grenze>
+                <grenze formel="$Vauflage$V*12">a5q,a4h</grenze>
+                <grenze formel="$Vauflage$V*13">a4q,a3h</grenze>
+                <grenze formel="$Vauflage$V*15">a3q</grenze>
+            </size>
+        </option>
+
+
+    </artikel>
+</kalkulation>
\ No newline at end of file
diff --git a/tests/TestFiles/Option/checkbox.xml b/tests/TestFiles/Option/checkbox.xml
new file mode 100644
index 0000000..9d04254
--- /dev/null
+++ b/tests/TestFiles/Option/checkbox.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<option id="size" name="Wählen Sie eine Größe" type="Checkbox" width="3" default="a4h,a4q" require="true" help="Wählen Sie eine Größe">
+    <opt id="a5h" name="DIN A5 Hochformat (210x148mm)"></opt>
+    <opt id="a5q" name="DIN A5 Querformat (148x210mm)"></opt>
+    <opt id="a4h" name="DIN A4 Hochformat (297 x 210 mm)"></opt>
+    <opt id="a4q" name="DIN A4 Querformat (210x297mm)"></opt>
+    <opt id="a3h" name="DIN A3 Hochformat (420x297mm)"></opt>
+    <opt id="a3q" name="DIN A3 Querformat (297x420mm)"></opt>
+</option>