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diff --git a/Master/Reference Architectures and Patterns/EJB 3.0 Code/Gerald Examples/src/examples/shop/logic/Pricer.java b/Master/Reference Architectures and Patterns/EJB 3.0 Code/Gerald Examples/src/examples/shop/logic/Pricer.java
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+++ b/Master/Reference Architectures and Patterns/EJB 3.0 Code/Gerald Examples/src/examples/shop/logic/Pricer.java
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+package examples.shop.logic;
+
+import java.util.List;
+
+import examples.shop.impl.entity.LineItem;
+
+/**
+ * These are the business logic methods exposed publicly by the
+ * Pricer component, a function that computes a price for a 
+ * given user and base price. 
+ */
+
+public interface Pricer {
+    /**
+     * Computes the price of a set of goods
+     */
+
+    public double priceSubtotal(String user, List<LineItem> items);
+    
+    public double priceTaxes(double subtotal);
+    
+    /**
+     * @return the applicable tax rate
+     */
+    double getTaxRate();
+
+    /**
+     * @return the current discount rate for buying lots of items
+     */
+    double getBulkDiscountRate();
+
+    /**
+     * @return the discount rate for a given user in percent 
+     */
+    double getPersonalDiscountRate(String userName);
+
+    /**
+     * This method computes the applicable discount in absolute
+     * figure, based on bulk and personal discounts that may apply.
+     * 
+     * @param quantity the number of items that a user intends to buy
+     * @param basePrice the overall, non-discounted volume of the
+     *        purchase (individual price times quantity)
+     * @param the user name
+     * @return the subTotal for the line item after applying any
+     *         applicable discounts, excluding taxes
+     */
+    double getDiscount(int quantity, double basePrice, String user);
+
+}