diff --git a/src/main/java/com/booleanuk/core/Article.java b/src/main/java/com/booleanuk/core/Article.java
index 1e359b0..1bb1781 100644
--- a/src/main/java/com/booleanuk/core/Article.java
+++ b/src/main/java/com/booleanuk/core/Article.java
@@ -1,35 +1,14 @@
 package com.booleanuk.core;
 
-public class Article {
-    String title;
+public class Article extends Item{
+    Author author;
 
-    boolean onLoan = false;
-
-    public Article(String title) {
-        this.title = title;
-    }
-
-    public boolean isOnLoan() {
-        return onLoan;
+    public Article(String title, Author author) {
+        super(title);
+        this.author = author;
     }
 
-    public String checkIn() {
-        if (!this.isOnLoan()) {
-            return "item is not currently on loan";
-        }
-
-        this.onLoan = false;
-
-        return "item has been checked in";
-    }
-
-    public String checkOut() {
-        if (this.isOnLoan()) {
-            return "item is currently on loan";
-        }
-
-        this.onLoan = true;
-
-        return "item has been checked out";
+    public Author getAuthor() {
+        return author;
     }
 }
diff --git a/src/main/java/com/booleanuk/core/Author.java b/src/main/java/com/booleanuk/core/Author.java
new file mode 100644
index 0000000..c66e0a2
--- /dev/null
+++ b/src/main/java/com/booleanuk/core/Author.java
@@ -0,0 +1,36 @@
+package com.booleanuk.core;
+
+public class Author {
+    String name;
+    String contactInfo;
+    String website;
+    public Author(String name, String contactInfo, String website) {
+        this.name = name;
+        this.contactInfo = contactInfo;
+        this.website = website;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getContactInfo() {
+        return contactInfo;
+    }
+
+    public void setContactInfo(String contactInfo) {
+        this.contactInfo = contactInfo;
+    }
+
+    public String getWebsite() {
+        return website;
+    }
+
+    public void setWebsite(String website) {
+        this.website = website;
+    }
+}
diff --git a/src/main/java/com/booleanuk/core/Book.java b/src/main/java/com/booleanuk/core/Book.java
index 9261f65..c38ce8c 100644
--- a/src/main/java/com/booleanuk/core/Book.java
+++ b/src/main/java/com/booleanuk/core/Book.java
@@ -1,35 +1,13 @@
 package com.booleanuk.core;
 
-public class Book {
-    String title;
-
-    boolean onLoan = false;
-
-    public Book(String title) {
-        this.title = title;
-    }
-
-    public boolean isOnLoan() {
-        return onLoan;
-    }
-
-    public String checkIn() {
-        if (!this.isOnLoan()) {
-            return "item is not currently on loan";
-        }
-
-        this.onLoan = false;
-
-        return "item has been checked in";
+public class Book extends Item {
+    Author author;
+    public Book(String title, Author author) {
+        super(title);
+        this.author = author;
     }
 
-    public String checkOut() {
-        if (this.isOnLoan()) {
-            return "item is currently on loan";
-        }
-
-        this.onLoan = true;
-
-        return "item has been checked out";
+    public Author getAuthor() {
+        return author;
     }
 }
diff --git a/src/main/java/com/booleanuk/core/Item.java b/src/main/java/com/booleanuk/core/Item.java
new file mode 100644
index 0000000..b2a2636
--- /dev/null
+++ b/src/main/java/com/booleanuk/core/Item.java
@@ -0,0 +1,35 @@
+package com.booleanuk.core;
+
+public class Item {
+    String title;
+
+    boolean onLoan = false;
+
+    public Item(String title) {
+        this.title = title;
+    }
+
+    public boolean isOnLoan() {
+        return onLoan;
+    }
+
+    public String checkIn() {
+        if (!this.isOnLoan()) {
+            return "item is not currently on loan";
+        }
+
+        this.onLoan = false;
+
+        return "item has been checked in";
+    }
+
+    public String checkOut() {
+        if (this.isOnLoan()) {
+            return "item is currently on loan";
+        }
+
+        this.onLoan = true;
+
+        return "item has been checked out";
+    }
+}
diff --git a/src/main/java/com/booleanuk/core/Library.java b/src/main/java/com/booleanuk/core/Library.java
index f03ecf0..232879a 100644
--- a/src/main/java/com/booleanuk/core/Library.java
+++ b/src/main/java/com/booleanuk/core/Library.java
@@ -1,95 +1,42 @@
 package com.booleanuk.core;
 
+import java.util.ArrayList;
 import java.util.List;
 
 public class Library {
-    List<Article> articles;
-    List<Book> books;
-    List<Newspaper> newspapers;
+    List<Item> items = new ArrayList<>();
 
-    public void addToStock(Article item) {
-        this.articles.add(item);
+    public void addToStock(Item item) {
+        this.items.add(item);
     }
-
-    public void addToStock(Book item) {
-        this.books.add(item);
-    }
-
-    public void addToStock(Newspaper item) {
-        this.newspapers.add(item);
+    public int seeList() {
+        return items.size();
     }
 
     // The following methods may contain code that you are unfamiliar with. The strange syntax of article -> something
     // is called a lambda expression (https://www.w3schools.com/java/java_lambda.asp)
-    public String checkInArticle(String title) {
-        List<Article> filtered = this.articles.stream()
-                .filter(article -> article.title.equals(title))
-                .toList();
-
-        if (filtered.size() < 1) {
-            return "item is not part of the library's collection";
-        }
-
-        return filtered.get(0).checkIn();
-    }
-
-    public String checkOutArticle(String title) {
-        List<Article> filtered = this.articles.stream()
-                .filter(article -> article.title.equals(title))
-                .toList();
-
-        if (filtered.size() < 1) {
-            return "item is not part of the library's collection";
-        }
-
-        return filtered.get(0).checkOut();
-    }
-
-    public String checkInBook(String title) {
-        List<Book> filtered = this.books.stream()
-                .filter(book -> book.title.equals(title))
+    public String checkInItem(String title) {
+        List<Item> filtered = this.items.stream()
+                .filter(item -> item.title.equals(title))
                 .toList();
 
-        if (filtered.size() < 1) {
+        if (filtered.isEmpty()) {
             return "item is not part of the library's collection";
         }
 
         return filtered.get(0).checkIn();
     }
 
-    public String checkOutBook(String title) {
-        List<Book> filtered = this.books.stream()
-                .filter(book -> book.title.equals(title))
+    public String checkOutItem(String title) {
+        List<Item> filtered = this.items.stream()
+                .filter(item -> item.title.equals(title))
                 .toList();
 
-        if (filtered.size() < 1) {
+        if (filtered.isEmpty()) {
             return "item is not part of the library's collection";
         }
 
         return filtered.get(0).checkOut();
     }
 
-    public String checkInNewspaper(String title) {
-        List<Newspaper> filtered = this.newspapers.stream()
-                .filter(newspaper -> newspaper.title.equals(title))
-                .toList();
-
-        if (filtered.size() < 1) {
-            return "item is not part of the library's collection";
-        }
-
-        return filtered.get(0).checkIn();
-    }
-
-    public String checkOutNewspaper(String title) {
-        List<Newspaper> filtered = this.newspapers.stream()
-                .filter(newspaper -> newspaper.title.equals(title))
-                .toList();
-
-        if (filtered.size() < 1) {
-            return "item is not part of the library's collection";
-        }
-
-        return filtered.get(0).checkOut();
-    }
 }
diff --git a/src/main/java/com/booleanuk/core/Newspaper.java b/src/main/java/com/booleanuk/core/Newspaper.java
index 8411d9c..6495f22 100644
--- a/src/main/java/com/booleanuk/core/Newspaper.java
+++ b/src/main/java/com/booleanuk/core/Newspaper.java
@@ -1,22 +1,15 @@
 package com.booleanuk.core;
 
-public class Newspaper {
-    String title;
-
-    boolean onLoan = false;
+public class Newspaper extends Item{
 
     public Newspaper(String title) {
-        this.title = title;
-    }
-
-    public boolean isOnLoan() {
-        return onLoan;
+        super(title);
     }
-
+    @Override
     public String checkIn() {
         return "newspapers are not available for loan";
     }
-
+    @Override
     public String checkOut() {
         return "newspapers are not available for loan";
     }
diff --git a/src/test/java/com/booleanuk/core/ArticleTest.java b/src/test/java/com/booleanuk/core/ArticleTest.java
index 00bbaeb..420ea16 100644
--- a/src/test/java/com/booleanuk/core/ArticleTest.java
+++ b/src/test/java/com/booleanuk/core/ArticleTest.java
@@ -4,15 +4,17 @@
 import org.junit.jupiter.api.Test;
 
 class ArticleTest {
+    Author author1 = new Author("Pesoa", "Portugal", "pesoa.com");
+    Author author2 = new Author("Deitel", "American", "deitel.com");
     @Test
     public void shouldCheckOutIfAvailable() {
-        Article article = new Article("JUnit Rocks");
+        Article article = new Article("JUnit Rocks", author1);
         Assertions.assertEquals("item has been checked out", article.checkOut());
     }
 
     @Test
     public void shouldDeclineIfNotAvailableToCheckout() {
-        Article article = new Article("JUnit Rocks");
+        Article article = new Article("JUnit Rocks", author2);
         article.checkOut();
 
         Assertions.assertEquals("item is currently on loan", article.checkOut());
@@ -20,7 +22,7 @@ public void shouldDeclineIfNotAvailableToCheckout() {
 
     @Test
     public void shouldCheckInIfOnLoan() {
-        Article article = new Article("JUnit Rocks");
+        Article article = new Article("JUnit Rocks", author1);
         article.checkOut();
 
         Assertions.assertEquals("item has been checked in", article.checkIn());
@@ -28,7 +30,7 @@ public void shouldCheckInIfOnLoan() {
 
     @Test
     public void shouldDeclineCheckInIfNotOnLoan() {
-        Article article = new Article("JUnit Rocks");
+        Article article = new Article("JUnit Rocks", author1);
 
         Assertions.assertEquals("item is not currently on loan", article.checkIn());
     }
diff --git a/src/test/java/com/booleanuk/core/BookTest.java b/src/test/java/com/booleanuk/core/BookTest.java
index 180a165..34bc42b 100644
--- a/src/test/java/com/booleanuk/core/BookTest.java
+++ b/src/test/java/com/booleanuk/core/BookTest.java
@@ -4,15 +4,17 @@
 import org.junit.jupiter.api.Test;
 
 public class BookTest {
+    Author author1 = new Author("Pesoa", "Portugal", "pesoa.com");
+    Author author2 = new Author("Deitel", "American", "deitel.com");
     @Test
     public void shouldCheckOutIfAvailable() {
-        Book book = new Book("JUnit Rocks");
+        Book book = new Book("JUnit Rocks", author2);
         Assertions.assertEquals("item has been checked out", book.checkOut());
     }
 
     @Test
     public void shouldDeclineIfNotAvailableToCheckout() {
-        Book book = new Book("JUnit Rocks");
+        Book book = new Book("JUnit Rocks", author2);
         book.checkOut();
 
         Assertions.assertEquals("item is currently on loan", book.checkOut());
@@ -20,7 +22,7 @@ public void shouldDeclineIfNotAvailableToCheckout() {
 
     @Test
     public void shouldCheckInIfOnLoan() {
-        Book book = new Book("JUnit Rocks");
+        Book book = new Book("JUnit Rocks", author2);
         book.checkOut();
 
         Assertions.assertEquals("item has been checked in", book.checkIn());
@@ -28,7 +30,7 @@ public void shouldCheckInIfOnLoan() {
 
     @Test
     public void shouldDeclineCheckInIfNotOnLoan() {
-        Book book = new Book("JUnit Rocks");
+        Book book = new Book("JUnit Rocks", author2);
 
         Assertions.assertEquals("item is not currently on loan", book.checkIn());
     }
diff --git a/src/test/java/com/booleanuk/core/ItemTest.java b/src/test/java/com/booleanuk/core/ItemTest.java
new file mode 100644
index 0000000..8a85852
--- /dev/null
+++ b/src/test/java/com/booleanuk/core/ItemTest.java
@@ -0,0 +1,35 @@
+package com.booleanuk.core;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class ItemTest {
+    @Test
+    public void shouldCheckOutIfAvailable() {
+        Item item = new Item("JUnit Rocks");
+        Assertions.assertEquals("item has been checked out", item.checkOut());
+    }
+
+    @Test
+    public void shouldDeclineIfNotAvailableToCheckout() {
+        Item item = new Item("JUnit Rocks");
+        item.checkOut();
+
+        Assertions.assertEquals("item is currently on loan", item.checkOut());
+    }
+
+    @Test
+    public void shouldCheckInIfOnLoan() {
+        Item item = new Item("JUnit Rocks");
+        item.checkOut();
+
+        Assertions.assertEquals("item has been checked in", item.checkIn());
+    }
+
+    @Test
+    public void shouldDeclineCheckInIfNotOnLoan() {
+        Item item = new Item("JUnit Rocks");
+
+        Assertions.assertEquals("item is not currently on loan", item.checkIn());
+    }
+}
diff --git a/src/test/java/com/booleanuk/core/LibraryTest.java b/src/test/java/com/booleanuk/core/LibraryTest.java
new file mode 100644
index 0000000..26b7c0a
--- /dev/null
+++ b/src/test/java/com/booleanuk/core/LibraryTest.java
@@ -0,0 +1,19 @@
+package com.booleanuk.core;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class LibraryTest {
+    Author author1 = new Author("Pesoa", "Portugal", "pesoa.com");
+    Author author2 = new Author("Deitel", "American", "deitel.com");
+    @Test
+    public void addStockTest() {
+        Library library = new Library();
+        Book book = new Book("book1", author1);
+        Article article = new Article("article1", author2);
+        library.addToStock(book);
+        Assertions.assertEquals(1, library.seeList());
+        library.addToStock(article);
+        Assertions.assertEquals(2, library.seeList());
+    }
+}