diff --git a/swap_meet/clothing.py b/swap_meet/clothing.py
new file mode 100644
index 000000000..807bd24fe
--- /dev/null
+++ b/swap_meet/clothing.py
@@ -0,0 +1,18 @@
+from .item import Item
+
+class Clothing(Item):
+    """Class `Item`'s Child class.
+
+    Starts with default values for `condition` and `age`.
+    Initializes with a named attribute for its type, `"Clothing"`.
+    """
+
+    def __init__(self, condition=0, age=0):
+        super()
+        self.category = "Clothing"
+        self.condition = condition
+        self.age = age
+
+    def __str__(self):
+        return "The finest clothing you could wear."
+
diff --git a/swap_meet/decor.py b/swap_meet/decor.py
new file mode 100644
index 000000000..6a8a62625
--- /dev/null
+++ b/swap_meet/decor.py
@@ -0,0 +1,17 @@
+from .item import Item
+
+class Decor(Item):
+    """Class `Item`'s Child class.
+
+    Starts with default values for `condition` and `age`.
+    Initializes with a named attribute for its type, `"Decor"`.
+    """
+
+    def __init__(self, condition=0, age=0):
+        super()
+        self.category = "Decor"
+        self.condition = condition
+        self.age = age
+
+    def __str__(self):
+        return "Something to decorate your space."
\ No newline at end of file
diff --git a/swap_meet/electronics.py b/swap_meet/electronics.py
new file mode 100644
index 000000000..606cfa6d2
--- /dev/null
+++ b/swap_meet/electronics.py
@@ -0,0 +1,17 @@
+from .item import Item
+
+class Electronics(Item):
+    """Class `Item`'s Child class.
+
+    Starts with default values for `condition` and `age`.
+    Initializes with a named attribute for its type, `"Electronics"`.
+    """
+
+    def __init__(self, condition=0, age=0):
+        super()
+        self.category = "Electronics"
+        self.condition = condition
+        self.age = age
+
+    def __str__(self):
+        return "A gadget full of buttons and secrets."
\ No newline at end of file
diff --git a/swap_meet/item.py b/swap_meet/item.py
new file mode 100644
index 000000000..7ab1a3203
--- /dev/null
+++ b/swap_meet/item.py
@@ -0,0 +1,47 @@
+class Item:
+    """Represents an item. Parent class for `Clothing`, `Decor`, and `Electronics` child classes. `Vendor` instances can have `Item` instances in their `inventory`.
+
+    Attributes:
+        condition (int): An optional attribute that defaults to 0 when not
+            passed into an `Item` object instance. Used to reference an item's
+            description based in values that range from 0 to 5, where 0
+            describes an item in "Poor" condition, and 5 describes an item 
+            that is "Like New".
+
+        category (str): An empty string by default. Represents the category 
+            of an item. Instances can optionally pass in a string with the
+            keyword argument `category`.
+    """
+
+    def __init__(self, category=""):
+        self.condition = 0
+        self.category = category
+        self.age = 0
+
+    # Wave 5
+
+    def condition_description(self):
+        """Instance method that describes the condition of an item in words based on its `condition`, in a range from 0 to 5. 
+        
+        Child classes inherit this method as-is, but are able to override it if necessary. The one requirement is that the `condition_description` for all three classes above have the same behavior.
+
+        Returns:
+            [type]: [description]
+        """
+
+        descriptions = {
+        5: "Like New",
+        4: "Mint",
+        3: "Very Good",
+        2: "Good",
+        1: "Fair",
+        0: "Poor"
+        }
+
+        if self.condition not in descriptions:
+            return None
+        return descriptions[self.condition]
+
+    def __str__(self):
+        """Printable string representation of an Item instance."""        
+        return "Hello World!"
diff --git a/swap_meet/vendor.py b/swap_meet/vendor.py
new file mode 100644
index 000000000..97d80eb3f
--- /dev/null
+++ b/swap_meet/vendor.py
@@ -0,0 +1,201 @@
+from .item import Item
+
+class Vendor:
+    """Creates instances of a vendor and their list of items. 
+
+    If a Vendor object is instantiated without arguments, it's attributes will have default values.
+
+    Attributes:
+        inventory: An empty list by default. Instances can optionally pass in
+            a list with the keyword argument `inventory`.
+    """
+
+    def __init__(self, inventory=None):
+        if inventory is None:
+            self.inventory = []
+        else:
+            self.inventory = inventory
+
+    def add(self, item):
+        """Adds the `item` to the `inventory`.
+
+        Args:
+            item (str): The item to be added. 
+
+        Returns:
+            item (str): The item that was added.
+        """
+
+        self.inventory.append(item)
+        return item
+
+    def remove(self, item):
+        """Removes the matching `item` from the `inventory`.
+
+        Args:
+            item (str): The item that will be removed.
+
+        Returns:
+            item (str): The item that was removed. If there is no matching item
+                in the `inventory`, returns `False`.
+        """
+
+        if item in self.inventory:
+            self.inventory.remove(item)
+            return item
+        return False
+
+    def get_by_category(self, category):
+        """Iterates over the `inventory` to find the categories of the items in that list. 
+
+        Args:
+            category (str): Represents the `category` of the items.
+
+        Returns:
+            same_category_items: A list of `Item`s in the `inventory` with that
+                `category`.
+        """
+
+        same_category_items = []
+        for item in self.inventory:
+            if item.category == category:
+                same_category_items.append(item)
+        return same_category_items
+
+    def swap_items(self, friend, my_item, their_item):
+        """Removes `my_item` from this `Vendor`'s `inventory` and adds it to the `friend`'s `inventory`.
+
+        Args:
+            friend (object): An instance of another `Vendor`, representing the
+                friend that this `Vendor` instance is swapping with.
+
+            my_item (str): Represents the item this `Vendor` instance plans to
+                give.
+
+            their_item (str): Represents the item the `friend` plans to give.
+
+        Returns:
+            bool: If this `Vendor`'s `inventory` doesn't contain `my_item` or
+                the `friend`'s `inventory` doesn't contain `their_item`,
+                returns `False`; otherwise, returns `True`.
+        """
+
+        if my_item in self.inventory and their_item in friend.inventory:
+            self.remove(my_item)
+            friend.add(my_item)
+            friend.remove(their_item)
+            self.add(their_item)
+            return True
+        return False
+
+    def swap_first_item(self, friend):
+        """Swaps the first item in this `Vendor`'s `inventory` with the first item in the `friend`'s `inventory`.
+
+        Args:
+            friend (object): An instance of another `Vendor`, representing the
+                friend that this `Vendor` instance is swapping with.
+
+        Returns:
+            bool: If either itself or the `friend` have an empty `inventory`,
+                returns `False`. Otherwise, returns True.
+        """
+
+        if not self.inventory or not friend.inventory:
+            return False
+        else:
+            my_item = self.inventory.pop(0)
+            self.add(friend.inventory.pop(0))
+            friend.add(my_item)
+            return True
+
+    def get_best_by_category(self, item_category):
+        """Gets the item with the best `condition` in a certain `category`.
+
+        Args:
+            item_category (str): Represents the `category` of the items.
+
+        Returns:
+            best_item: A single item, even if there are duplicates (two or more
+                of the same item with the same `condition`). If there are no
+                items in the `inventory` that match the `category`, returns `None`.
+        """
+
+        best_cond = 0
+        best_item = None
+
+        for item in self.get_by_category(item_category):
+            if item.condition > best_cond:
+                best_item = item
+                best_cond = item.condition
+        return best_item
+
+    def swap_best_by_category(self, other, my_priority, their_priority):
+        """Swaps the best item of certain categories with another `Vendor`.
+
+        Args:
+            other (object): Represents another `Vendor` instance to trade with.
+
+            my_priority (str): Represents a `category` that this `Vendor`
+                instance wants to receive.
+
+            their_priority (str): Represents a `category` that `other` wants
+                to receive.
+
+        Returns:
+            bool: If any of both `Vendor` instances doesn't have an item that
+                matches a desired `category`, returns `False`; otherwise,
+                returns True.
+        """
+
+        mine = self.get_best_by_category(their_priority)
+        theirs = other.get_best_by_category(my_priority)
+        if not mine or not theirs:
+            return False
+        else:
+            return self.swap_items(other, mine, theirs)
+
+    def get_by_newest(self):
+        """`swap_by_newest`s helper method.
+        This is an instance method, so any instance can access to get the first newest `item` in their `inventory`.
+
+        TODO:
+            - Implement this method in a way that it also checks the categories
+                or conditions of the items.
+            - Have a special class for Vintage Items.
+
+        Returns:
+            newest_item: A single `item`, even if there are duplicates (two or 
+                more of the same item with the same `condition`). 
+                If there are no items in the `inventory` that match the `category`, returns `None`.
+        """
+
+        if self.inventory:
+            newest_item = self.inventory[0]
+            min_age = newest_item.age
+
+            for item in self.inventory:
+                if item.age < min_age:
+                    newest_item = item
+                    min_age = item.age
+            return newest_item
+        return None
+
+    def swap_by_newest(self, friend):
+        """Swaps the newest item in the inventory with another `Vendor`.
+
+        Args:
+            friend (object): An instance of another `Vendor`, representing the
+                friend that this `Vendor` instance is swapping with.
+
+        Returns:
+            bool: If any of both `Vendor` instances doesn't have an item in
+                their inventory, the swap does not occur; otherwise, returns True.
+        """
+
+        my_newest_item = self.get_by_newest()
+        their_newest_item = friend.get_by_newest()
+
+        if not my_newest_item or not their_newest_item:
+            return False
+        else:
+            self.swap_items(friend, my_newest_item, their_newest_item)
diff --git a/tests/test_wave_07_NEW.py b/tests/test_wave_07_NEW.py
new file mode 100644
index 000000000..76c2374bc
--- /dev/null
+++ b/tests/test_wave_07_NEW.py
@@ -0,0 +1,77 @@
+import pytest
+from swap_meet.vendor import Vendor
+from swap_meet.item import Item
+from swap_meet.clothing import Clothing
+from swap_meet.decor import Decor
+from swap_meet.electronics import Electronics
+
+
+def test_get_by_newest():
+    item_a = Clothing(age=2)
+    item_b = Decor(age=2)
+    item_c = Clothing(age=4)
+    item_d = Decor(age=5)
+    item_e = Clothing(age=1)
+    tai = Vendor(
+        inventory=[item_a, item_b, item_c, item_d, item_e]
+    )
+
+    newest_item = tai.get_by_newest()
+
+    # get_by_newest(self, friend)
+    assert newest_item == item_e
+
+
+def test_swap_by_newest_no_matches_is_none():
+    item_a = Decor(age=2.0)
+    item_b = Decor(age=1.0)
+    item_c = Decor(age=4.0)
+    item_d = Decor(age=8.0)
+
+    tai = Vendor(
+        inventory=[item_a, item_b, item_c]
+    )
+    ta = Vendor(
+        inventory=[item_d]
+    )
+    is_swap = tai.swap_by_newest(ta)
+
+    assert is_swap is not False
+    assert item_d in tai.inventory
+    assert item_b in ta.inventory
+    assert item_a not in ta.inventory
+
+
+
+
+def test_swap_by_newest_with_duplicates():
+    item_a = Clothing(age=2)
+    item_d = Clothing(age=2)
+    tai = Vendor(
+        inventory=[item_a]
+    )
+    ta = Vendor(
+        inventory=[item_d]
+    )
+    is_swap = tai.swap_by_newest(ta)
+
+    assert item_a in ta.inventory
+    assert is_swap is not False
+
+def test_swap_by_newest_returns_false():
+    tai = Vendor(
+        inventory=[]
+    )
+
+    item_d = Clothing(age=2)
+    item_e = Decor()
+    item_f = Clothing(age=5)
+    jesse = Vendor(
+        inventory=[item_d, item_e, item_f]
+    )
+
+    result = tai.swap_by_newest(
+        jesse
+    )
+
+    assert result is False