diff --git a/DotBased.ASP.Auth/BasedAuthConfiguration.cs b/DotBased.ASP.Auth/BasedAuthConfiguration.cs
index a996d1e..b09ecf0 100644
--- a/DotBased.ASP.Auth/BasedAuthConfiguration.cs
+++ b/DotBased.ASP.Auth/BasedAuthConfiguration.cs
@@ -3,7 +3,7 @@ namespace DotBased.ASP.Auth;
 public class BasedAuthConfiguration
 {
     /// <summary>
-    /// Allow users to registrate a user account.
+    /// Allow users to registrate.
     /// </summary>
     public bool AllowRegistration { get; set; }
     //TODO: Callback when a user registers, so the application can handle sending emails or generate a code to complete the registration.
diff --git a/DotBased.ASP.Auth/Domains/Auth/RoleModel.cs b/DotBased.ASP.Auth/Domains/Auth/RoleModel.cs
index 7822404..92b15c7 100644
--- a/DotBased.ASP.Auth/Domains/Auth/RoleModel.cs
+++ b/DotBased.ASP.Auth/Domains/Auth/RoleModel.cs
@@ -1,3 +1,5 @@
+using DotBased.Objects;
+
 namespace DotBased.ASP.Auth.Domains.Auth;
 
 public class RoleModel
@@ -6,4 +8,5 @@ public class RoleModel
     public string Name { get; set; } = string.Empty;
     public string Description { get; set; } = string.Empty;
     public List<PermissionModel> Permissions { get; set; } = [];
+    public List<DbObjectAttribute<IConvertible>> Attributes { get; set; } = [];
 }
\ No newline at end of file
diff --git a/DotBased.ASP.Auth/Domains/Identity/GroupModel.cs b/DotBased.ASP.Auth/Domains/Identity/GroupModel.cs
index 065f937..73ff377 100644
--- a/DotBased.ASP.Auth/Domains/Identity/GroupModel.cs
+++ b/DotBased.ASP.Auth/Domains/Identity/GroupModel.cs
@@ -1,4 +1,5 @@
 using DotBased.ASP.Auth.Domains.Auth;
+using DotBased.Objects;
 
 namespace DotBased.ASP.Auth.Domains.Identity;
 
@@ -8,4 +9,5 @@ public class GroupModel
     public string Name { get; set; } = string.Empty;
     public string Description { get; set; } = string.Empty;
     public List<RoleModel> Roles { get; set; } = [];
+    public List<DbObjectAttribute<IConvertible>> Attributes { get; set; } = [];
 }
\ No newline at end of file
diff --git a/DotBased.ASP.Auth/Domains/Identity/UserModel.cs b/DotBased.ASP.Auth/Domains/Identity/UserModel.cs
index ea92d97..b9a9f51 100644
--- a/DotBased.ASP.Auth/Domains/Identity/UserModel.cs
+++ b/DotBased.ASP.Auth/Domains/Identity/UserModel.cs
@@ -1,14 +1,31 @@
+using DotBased.ASP.Auth.Domains.Auth;
+using DotBased.Objects;
+
 namespace DotBased.ASP.Auth.Domains.Identity;
 
 public class UserModel
 {
     public string UserName { get; set; } = string.Empty;
+    public string PasswordHash { get; set; } = string.Empty;
     public string Email { get; set; } = string.Empty;
+    public string PhoneNumber { get; set; } = string.Empty;
     public string Name { get; set; } = string.Empty;
     public string FamilyName { get; set; } = string.Empty;
+    public DateTime Dob { get; set; }
 
     public string Id { get; set; } = Guid.NewGuid().ToString();
-    public string PasswordHash { get; set; } = string.Empty;
-    public string[] GroupIds { get; set; } = Array.Empty<string>();
-    public string[] Roles { get; set; } = Array.Empty<string>();
+    public bool Enabled { get; set; }
+    public bool EmailValidated { get; set; }
+    public bool PhoneNumberConfirmed { get; set; }
+    public bool Lockout { get; set; }
+    public DateTime LockoutEnd { get; set; }
+    public DateTime CreationStamp { get; set; }
+    public DateTime SecurityStamp { get; set; }
+    public DateTime ConcurrencyStamp { get; set; }
+    public int AccessFailedCount { get; set; }
+    public bool ExternalAuthentication { get; set; }
+
+    public List<GroupModel> Groups { get; set; } = [];
+    public List<RoleModel> Roles { get; set; } = [];
+    public List<DbObjectAttribute<IConvertible>> Attributes { get; set; } = [];
 }
\ No newline at end of file
diff --git a/DotBased/Objects/DbObjectAttribute.cs b/DotBased/Objects/DbObjectAttribute.cs
new file mode 100644
index 0000000..5a6eb78
--- /dev/null
+++ b/DotBased/Objects/DbObjectAttribute.cs
@@ -0,0 +1,14 @@
+using DotBased.Extensions;
+
+namespace DotBased.Objects;
+
+public class DbObjectAttribute<TValueType> : ObjectAttribute<TValueType>
+{
+    public DbObjectAttribute(string key, TValueType value, string owner) : base(key, value)
+    {
+        if (owner.IsNullOrWhiteSpace())
+            throw new ArgumentNullException(nameof(owner), $"The parameter {nameof(owner)} is null or empty! This parameter is required!");
+        Owner = owner;
+    }
+    public string Owner { get; set; }
+}
\ No newline at end of file
diff --git a/DotBased/Objects/IObjectAttribute.cs b/DotBased/Objects/IObjectAttribute.cs
new file mode 100644
index 0000000..83b3f37
--- /dev/null
+++ b/DotBased/Objects/IObjectAttribute.cs
@@ -0,0 +1,7 @@
+namespace DotBased.Objects;
+
+public interface IObjectAttribute<TValueType>
+{
+    public string Key { get; set; }
+    public TValueType? Value { get; set; }
+}
\ No newline at end of file
diff --git a/DotBased/Objects/ObjectAttribute.cs b/DotBased/Objects/ObjectAttribute.cs
new file mode 100644
index 0000000..a56298d
--- /dev/null
+++ b/DotBased/Objects/ObjectAttribute.cs
@@ -0,0 +1,16 @@
+using DotBased.Extensions;
+
+namespace DotBased.Objects;
+
+public class ObjectAttribute<TValueType> : IObjectAttribute<TValueType>
+{
+    protected ObjectAttribute(string key, TValueType value)
+    {
+        if (key.IsNullOrWhiteSpace())
+            throw new ArgumentNullException(nameof(key), $"The parameter {nameof(key)} is null or empty!");
+        Key = key;
+        Value = value;
+    }
+    public string Key { get; set; }
+    public TValueType? Value { get; set; }
+}
\ No newline at end of file