diff --git a/C968Project/Inventory.cs b/C968Project/Inventory.cs
index a8a18c9..a3c959e 100644
--- a/C968Project/Inventory.cs
+++ b/C968Project/Inventory.cs
@@ -1,3 +1,4 @@
+using System;
 using System.ComponentModel;
 
 namespace C968Project;
@@ -7,32 +8,87 @@ public class Inventory
     public BindingList<Product> Products { get; set; }
     public BindingList<Part> Parts { get; set; }
     
-    public void AddProduct(Product product){}
+    public void AddProduct(Product product)
+    {
+        if (!Products.Contains(product))
+        {
+            Products.Add(product);
+            return;
+        }
+
+        MessageBox.Show($"Identical product already exists", "Error", MessageBoxButtons.OK);
+    }
 
     public bool RemoveProduct(int productIndex)
     {
-        return false;
+        if (productIndex > Products.Count)
+        {
+            MessageBox.Show($"Error occured when trying to delete product with index of {productIndex}. Out of bounds.", "Error", MessageBoxButtons.OK);
+            return false;
+        }
+
+        Products.RemoveAt(productIndex);
+        return true;
     }
 
-    public Product LookupProduct(int partIndex)
+    public Product? LookupProduct(int productIndex)
     {
-        return null;
+        if (productIndex > Products.Count)
+        {
+            MessageBox.Show($"Error occured when trying to find product with index of {productIndex}. Out of bounds.", "Error", MessageBoxButtons.OK);
+            return null;
+        }
+
+        return Products[productIndex];
+    }
+    public void UpdateProduct(int index, Product newProduct)
+    {
+        if (index > Products.Count)
+        {
+            MessageBox.Show($"Error occured when trying to update product with index of {index}. Out of bounds.", "Error", MessageBoxButtons.OK);
+            return;
+        }
+
+        Products[index] = newProduct;
     }
-    public void UpdateProduct(int index, Product newProduct){}
     
     
-    public void AddPart(Part part){}
+    public void AddPart(Part part)
+    {
+        if (!Parts.Contains(part))
+        {
+            Parts.Add(part);
+            return;
+        }
+
+        MessageBox.Show($"Identical part already exists", "Error", MessageBoxButtons.OK);
+    }
 
     public bool DeletePart(Part part)
     {
-        return false;
+        return Parts.Remove(part);
     }
 
     public Part LookupPart(int partIndex)
     {
-        return null;
+        if (partIndex > Parts.Count)
+        {
+            MessageBox.Show($"Error occured when trying to find part with index of {partIndex}. Out of bounds.", "Error", MessageBoxButtons.OK);
+            return null;
+        }
+
+        return Parts[partIndex];
     }
     
-    public void UpdatePart(int index, Part newPart){}
+    public void UpdatePart(int index, Part newPart)
+    {
+        if (index > Parts.Count)
+        {
+            MessageBox.Show($"Error occured when trying to update part with index of {index}. Out of bounds.", "Error", MessageBoxButtons.OK);
+            return;
+        }
+
+        Parts[index] = newPart;
+    }
     
 }
\ No newline at end of file
diff --git a/C968Project/Program.cs b/C968Project/Program.cs
index b4a9560..9207d58 100644
--- a/C968Project/Program.cs
+++ b/C968Project/Program.cs
@@ -4,6 +4,9 @@ namespace C968Project;
 
 static class Program
 {
+
+    public static Inventory Inventory = new();
+
     /// <summary>
     ///  The main entry point for the application.
     /// </summary>
diff --git a/C968Project/Views/MainScreen.cs b/C968Project/Views/MainScreen.cs
index 620e748..8ca5f03 100644
--- a/C968Project/Views/MainScreen.cs
+++ b/C968Project/Views/MainScreen.cs
@@ -5,5 +5,8 @@ public partial class MainScreen : Form
     public MainScreen()
     {
         InitializeComponent();
+
+        productsDataGridView.DataSource = Program.Inventory.Products;
+        partsDataGridView.DataSource = Program.Inventory.Parts;
     }
 }
\ No newline at end of file