diff --git a/src/entity/color/ColorInterface.php b/src/entity/color/ColorInterface.php
new file mode 100644
index 0000000..5fe2025
--- /dev/null
+++ b/src/entity/color/ColorInterface.php
@@ -0,0 +1,16 @@
+<?php
+namespace entity\color;
+
+/**
+ * In a real Application color would be saved in the database
+ * Otherwise it's agains "Normalisierung" ;) 
+ * @author kevinfrantz
+ *        
+ */
+interface ColorInterface
+{
+    public function setColor(string $color):void;
+
+    public function getColor():string;
+}
+
diff --git a/src/entity/currency/CurrencyInterface.php b/src/entity/currency/CurrencyInterface.php
new file mode 100644
index 0000000..1b2dafb
--- /dev/null
+++ b/src/entity/currency/CurrencyInterface.php
@@ -0,0 +1,41 @@
+<?php
+namespace entity\currency;
+
+/**
+ *
+ * @author kevinfrantz
+ *        
+ */
+interface CurrencyInterface
+{
+    /**
+     * Sets the value of the currency
+     * @param int $cents
+     */
+    public function setCents(int $cents):void;
+    
+    /**
+     * Returns the currency value in cents
+     * @return int
+     */
+    public function getCents():int;
+    
+    /**
+     * Returns the currency value as float (rounded on two decimal behind the )
+     * @return float
+     */
+    public function getFloat():float;
+    
+    /**
+     * Returns the name of the currency
+     * @return string
+     */
+    public function getName():string;
+    
+    /**
+     * Returns the symbol of the currency
+     * @return string
+     */
+    public function getSymbol():string;
+}
+
diff --git a/src/entity/image/ImageInterface.php b/src/entity/image/ImageInterface.php
new file mode 100644
index 0000000..c9d306e
--- /dev/null
+++ b/src/entity/image/ImageInterface.php
@@ -0,0 +1,26 @@
+<?php
+namespace entity\image;
+
+/**
+ *
+ * @author kevinfrantz
+ *        
+ */
+interface ImageInterface
+{
+    /**
+     * @param string $path
+     */
+    public function setImage(string $path):void;
+    
+    /**
+     * @return string
+     */
+    public function getImage():string;
+    
+    /**
+     * @return string
+     */
+    public function getImageThumbnail():string;
+}
+
diff --git a/src/entity/order/OrderInterface.php b/src/entity/order/OrderInterface.php
new file mode 100644
index 0000000..59cc08b
--- /dev/null
+++ b/src/entity/order/OrderInterface.php
@@ -0,0 +1,59 @@
+<?php
+namespace entity\order;
+
+use entity\product\ProductInterface;
+use Doctrine\Common\Collections\ArrayCollection;
+use entity\user\UserInterface;
+
+/**
+ * Status in this class is bool
+ * True when order is finished
+ * Fales when order is open
+ * 
+ * In a real application an entity status would be helpfull ;)
+ * 
+ * @author kevinfrantz
+ *        
+ */
+interface OrderInterface
+{
+    /**
+     * @param ProductInterface $product
+     */
+    public function addProduct(ProductInterface $product):void;
+    
+    /**
+     * @param ProductInterface $product
+     */
+    public function removeProduct(ProductInterface $product):void;
+    
+    /**
+     * @return ArrayCollection
+     */
+    public function getProducts():ArrayCollection;
+    
+    /**
+     * @return int
+     */
+    public function getId():int;
+    
+    /**
+     * @return UserInterface
+     */
+    public function getCustomer():UserInterface;
+    
+    /**
+     * @param UserInterface $customer
+     */
+    public function setCutomer(UserInterface $customer);
+    
+    /**
+     * @param bool $status
+     */
+    public function setStatus(bool $status):void;
+    
+    /**
+     * @return bool
+     */
+    public function getStatus():bool;
+}
\ No newline at end of file
diff --git a/src/entity/payment/PaymentInterface.php b/src/entity/payment/PaymentInterface.php
new file mode 100644
index 0000000..0f2bd2e
--- /dev/null
+++ b/src/entity/payment/PaymentInterface.php
@@ -0,0 +1,12 @@
+<?php
+namespace entity\payment;
+
+/**
+ *
+ * @author kevinfrantz
+ *        
+ */
+interface PaymentInterface
+{
+}
+
diff --git a/src/entity/price/PriceInterface.php b/src/entity/price/PriceInterface.php
new file mode 100644
index 0000000..674bdd1
--- /dev/null
+++ b/src/entity/price/PriceInterface.php
@@ -0,0 +1,31 @@
+<?php
+namespace entity\price;
+
+use entity\currency\CurrencyInterface;
+
+/**
+ *
+ * @author kevinfrantz
+ *        
+ */
+interface PriceInterface
+{
+    /**
+     * Sets the price
+     * @param CurrencyInterface $price
+     */
+    public function setPrice(CurrencyInterface $price):void;
+    
+    /**
+     * Returns the netto price
+     * @return int
+     */
+    public function getNetto():CurrencyInterface;
+    
+    /**
+     * Returns the gross price
+     * @return int
+     */
+    public function getGross():CurrencyInterface;
+}
+
diff --git a/src/entity/product/ProductInterface.php b/src/entity/product/ProductInterface.php
new file mode 100644
index 0000000..04de0e2
--- /dev/null
+++ b/src/entity/product/ProductInterface.php
@@ -0,0 +1,63 @@
+<?php
+namespace entity\product;
+
+use entity\price\PriceInterface;
+use entity\image\ImageInterface;
+use entity\color\ColorInterface;
+
+/**
+ * Attention:
+ * This interface containes the accercors for color.
+ * In a real application I wouldn't hardcode acceccors for a special attribute into the product.
+ * Instead I would make an ArrayCollection $attributes which containes all of the product attributes. 
+ * @author kevinfrantz
+ *        
+ */
+interface ProductInterface
+{
+    /**
+     * @return PriceInterface
+     */
+    public function getPrice():PriceInterface;
+    
+    /**
+     * @param PriceInterface $price
+     */
+    public function setPrice(PriceInterface $price):void;
+    
+    /**
+     * @param ImageInterface $image
+     */
+    public function setImage(ImageInterface $image):void;
+    
+    /**
+     * @return ImageInterface
+     */
+    public function getImage():ImageInterface;
+    
+    /**
+     * @return string
+     */
+    public function getName():string;
+    
+    /**
+     * @param string $name
+     */
+    public function setName(string $name):void;
+    
+    /**
+     * @return ColorInterface
+     */
+    public function getColor():ColorInterface;
+    
+    /**
+     * @param ColorInterface $color
+     */
+    public function setColor(ColorInterface $color):void;
+    
+    /**
+     * @return int
+     */
+    public function getId():int;
+}
+
diff --git a/src/entity/user/UserInterface.php b/src/entity/user/UserInterface.php
new file mode 100644
index 0000000..739b58c
--- /dev/null
+++ b/src/entity/user/UserInterface.php
@@ -0,0 +1,49 @@
+<?php
+namespace entity\user;
+
+/**
+ * Theoreticly you could make an own entity for name
+ * (Depends on the use case.)
+ * In this case I just assume that the user just has an username, which is just a string
+ * The same counts for email ;) -> In a real application: Entity Email ;)
+ * @author kevinfrantz
+ *        
+ */
+interface UserInterface
+{
+    /**
+     * @param string $hash
+     */
+    public function setPasswordHash(string $hash):void;
+    
+    /**
+     * @return string
+     */
+    public function getPasswordHash():string;
+    
+    /**
+     * @param string $name
+     */
+    public function setName(string $name):void;
+    
+    /**
+     * @return string
+     */
+    public function getName():string;
+    
+    /**
+     * @param string $email
+     */
+    public function setEmail(string $email):void;
+    
+    /**
+     * @return string
+     */
+    public function getEmail():string;
+    
+    /**
+     * @return int
+     */
+    public function getId():int;
+}
+