diff --git a/src/Volo.Abp.Identity/Volo.Abp.Identity.xproj b/src/Volo.Abp.Identity/Volo.Abp.Identity.xproj
index 8b01b0a7a5..c205403593 100644
--- a/src/Volo.Abp.Identity/Volo.Abp.Identity.xproj
+++ b/src/Volo.Abp.Identity/Volo.Abp.Identity.xproj
@@ -4,18 +4,17 @@
     <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">14.0</VisualStudioVersion>
     <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
   </PropertyGroup>
-
   <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.Props" Condition="'$(VSToolsPath)' != ''" />
   <PropertyGroup Label="Globals">
     <ProjectGuid>17dbb40a-243e-41f7-a672-fa316ecb1e33</ProjectGuid>
-    <RootNamespace>Volo.Abp.Identity</RootNamespace>
+    <RootNamespace>
+    </RootNamespace>
     <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.\obj</BaseIntermediateOutputPath>
     <OutputPath Condition="'$(OutputPath)'=='' ">.\bin\</OutputPath>
     <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
   </PropertyGroup>
-
   <PropertyGroup>
     <SchemaVersion>2.0</SchemaVersion>
   </PropertyGroup>
   <Import Project="$(VSToolsPath)\DotNet\Microsoft.DotNet.targets" Condition="'$(VSToolsPath)' != ''" />
-</Project>
+</Project>
\ No newline at end of file
diff --git a/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityRole.cs b/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityRole.cs
new file mode 100644
index 0000000000..f9da7f8f56
--- /dev/null
+++ b/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityRole.cs
@@ -0,0 +1,65 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using JetBrains.Annotations;
+using Volo.Abp.Domain.Entities;
+
+namespace Volo.Abp.Identity
+{
+    //TODO: Should set Id to a GUID (where? on repository?)
+    //TODO: Properties should not be public!
+
+    /// <summary>
+    /// Represents a role in the identity system
+    /// </summary>
+    public class IdentityRole : Entity
+    {
+        /// <summary>
+        /// Gets or sets the name for this role.
+        /// </summary>
+        public virtual string Name { get; set; }
+
+        /// <summary>
+        /// Gets or sets the normalized name for this role.
+        /// </summary>
+        public virtual string NormalizedName { get; set; }
+
+        /// <summary>
+        /// Navigation property for claims in this role.
+        /// </summary>
+        public virtual ICollection<IdentityRoleClaim> Claims { get; } = new Collection<IdentityRoleClaim>();
+
+        /// <summary>
+        /// A random value that should change whenever a role is persisted to the store
+        /// </summary>
+        public virtual string ConcurrencyStamp { get; set; } = Guid.NewGuid().ToString();
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="IdentityRole"/>.
+        /// </summary>
+        protected IdentityRole() { }
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="IdentityRole"/>.
+        /// </summary>
+        /// <param name="name">The role name.</param>
+        public IdentityRole([NotNull] string name)
+        {
+            Check.NotNull(name, nameof(name));
+
+            Name = name;
+        }
+
+        /// <summary>
+        /// Returns the name of the role.
+        /// </summary>
+        /// <returns>The name of the role.</returns>
+        public override string ToString()
+        {
+            return Name;
+        }
+    }
+}
diff --git a/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityRoleClaim.cs b/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityRoleClaim.cs
new file mode 100644
index 0000000000..d62d303535
--- /dev/null
+++ b/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityRoleClaim.cs
@@ -0,0 +1,61 @@
+using System.Security.Claims;
+using JetBrains.Annotations;
+using Volo.Abp.Domain.Entities;
+
+namespace Volo.Abp.Identity
+{
+    /// <summary>
+    /// Represents a claim that is granted to all users within a role.
+    /// </summary>
+    public class IdentityRoleClaim : Entity
+    {
+        /// <summary>
+        /// Gets or sets the of the primary key of the role associated with this claim.
+        /// </summary>
+        public virtual string RoleId { get; protected set; }
+
+        /// <summary>
+        /// Gets or sets the claim type for this claim.
+        /// </summary>
+        public virtual string ClaimType { get; protected set; }
+
+        /// <summary>
+        /// Gets or sets the claim value for this claim.
+        /// </summary>
+        public virtual string ClaimValue { get; protected set; }
+
+        protected IdentityRoleClaim()
+        {
+            
+        }
+
+        public IdentityRoleClaim([NotNull] string roleId, [NotNull] Claim claim)
+        {
+            Check.NotNull(roleId, nameof(roleId));
+            Check.NotNull(claim, nameof(claim));
+
+            RoleId = roleId;
+            ClaimType = claim.Type;
+            ClaimValue = claim.Value;
+        }
+
+        public IdentityRoleClaim([NotNull] string roleId, [NotNull] string claimType, string claimValue)
+        {
+            Check.NotNull(roleId, nameof(roleId));
+            Check.NotNull(claimType, nameof(claimType));
+
+            RoleId = roleId;
+            ClaimType = claimType;
+            ClaimValue = claimValue;
+        }
+
+        /// <summary>
+        /// Constructs a new claim with the type and value.
+        /// </summary>
+        /// <returns></returns>
+        public virtual Claim ToClaim()
+        {
+            return new Claim(ClaimType, ClaimValue);
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUser.cs b/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUser.cs
new file mode 100644
index 0000000000..b803419ccd
--- /dev/null
+++ b/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUser.cs
@@ -0,0 +1,126 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using JetBrains.Annotations;
+using Volo.Abp.Domain.Entities;
+
+namespace Volo.Abp.Identity
+{
+    //TODO: Should set Id to a GUID (where? on repository?)
+    //TODO: Properties should not be public!
+    
+    public class IdentityUser : Entity
+    {
+        /// <summary>
+        /// Gets or sets the user name for this user.
+        /// </summary>
+        public virtual string UserName { get; set; }
+
+        /// <summary>
+        /// Gets or sets the normalized user name for this user.
+        /// </summary>
+        public virtual string NormalizedUserName { get; set; }
+
+        /// <summary>
+        /// Gets or sets the email address for this user.
+        /// </summary>
+        public virtual string Email { get; set; }
+
+        /// <summary>
+        /// Gets or sets the normalized email address for this user.
+        /// </summary>
+        public virtual string NormalizedEmail { get; set; }
+
+        /// <summary>
+        /// Gets or sets a flag indicating if a user has confirmed their email address.
+        /// </summary>
+        /// <value>True if the email address has been confirmed, otherwise false.</value>
+        public virtual bool EmailConfirmed { get; set; }
+
+        /// <summary>
+        /// Gets or sets a salted and hashed representation of the password for this user.
+        /// </summary>
+        public virtual string PasswordHash { get; set; }
+
+        /// <summary>
+        /// A random value that must change whenever a users credentials change (password changed, login removed)
+        /// </summary>
+        public virtual string SecurityStamp { get; set; }
+
+        /// <summary>
+        /// A random value that must change whenever a user is persisted to the store
+        /// </summary>
+        public virtual string ConcurrencyStamp { get; set; } = Guid.NewGuid().ToString();
+
+        /// <summary>
+        /// Gets or sets a telephone number for the user.
+        /// </summary>
+        public virtual string PhoneNumber { get; set; }
+
+        /// <summary>
+        /// Gets or sets a flag indicating if a user has confirmed their telephone address.
+        /// </summary>
+        /// <value>True if the telephone number has been confirmed, otherwise false.</value>
+        public virtual bool PhoneNumberConfirmed { get; set; }
+
+        /// <summary>
+        /// Gets or sets a flag indicating if two factor authentication is enabled for this user.
+        /// </summary>
+        /// <value>True if 2fa is enabled, otherwise false.</value>
+        public virtual bool TwoFactorEnabled { get; set; }
+
+        /// <summary>
+        /// Gets or sets the date and time, in UTC, when any user lockout ends.
+        /// </summary>
+        /// <remarks>
+        /// A value in the past means the user is not locked out.
+        /// </remarks>
+        public virtual DateTimeOffset? LockoutEnd { get; set; }
+
+        /// <summary>
+        /// Gets or sets a flag indicating if the user could be locked out.
+        /// </summary>
+        /// <value>True if the user could be locked out, otherwise false.</value>
+        public virtual bool LockoutEnabled { get; set; }
+
+        /// <summary>
+        /// Gets or sets the number of failed login attempts for the current user.
+        /// </summary>
+        public virtual int AccessFailedCount { get; set; }
+
+        /// <summary>
+        /// Navigation property for the roles this user belongs to.
+        /// </summary>
+        public virtual ICollection<IdentityUserRole> Roles { get; } = new Collection<IdentityUserRole>();
+
+        /// <summary>
+        /// Navigation property for the claims this user possesses.
+        /// </summary>
+        public virtual ICollection<IdentityUserClaim> Claims { get; } = new Collection<IdentityUserClaim>();
+
+        /// <summary>
+        /// Navigation property for this users login accounts.
+        /// </summary>
+        public virtual ICollection<IdentityUserLogin> Logins { get; } = new Collection<IdentityUserLogin>();
+
+        protected IdentityUser()
+        {
+
+        }
+
+        public IdentityUser([NotNull] string userName)
+        {
+            Check.NotNull(userName, nameof(userName));
+
+            UserName = userName;
+        }
+
+        /// <summary>
+        /// Returns the username for this user.
+        /// </summary>
+        public override string ToString()
+        {
+            return $"{base.ToString()} UserName = {UserName}";
+        }
+    }
+}
diff --git a/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUserClaim.cs b/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUserClaim.cs
new file mode 100644
index 0000000000..b7ff073cf5
--- /dev/null
+++ b/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUserClaim.cs
@@ -0,0 +1,61 @@
+using System.Security.Claims;
+using JetBrains.Annotations;
+using Volo.Abp.Domain.Entities;
+
+namespace Volo.Abp.Identity
+{
+    /// <summary>
+    /// Represents a claim that a user possesses. 
+    /// </summary>
+    public class IdentityUserClaim : Entity
+    {
+        /// <summary>
+        /// Gets or sets the primary key of the user associated with this claim.
+        /// </summary>
+        public virtual string UserId { get; protected set; }
+
+        /// <summary>
+        /// Gets or sets the claim type for this claim.
+        /// </summary>
+        public virtual string ClaimType { get; protected set; }
+
+        /// <summary>
+        /// Gets or sets the claim value for this claim.
+        /// </summary>
+        public virtual string ClaimValue { get; protected set; }
+
+        protected IdentityUserClaim()
+        {
+            
+        }
+
+        public IdentityUserClaim([NotNull] string userId, [NotNull] Claim claim)
+        {
+            Check.NotNull(userId, nameof(userId));
+            Check.NotNull(claim, nameof(claim));
+
+            UserId = userId;
+            ClaimType = claim.Type;
+            ClaimValue = claim.Value;
+        }
+
+        public IdentityUserClaim([NotNull] string userId, [NotNull] string claimType, string claimValue)
+        {
+            Check.NotNull(userId, nameof(userId));
+            Check.NotNull(claimType, nameof(claimType));
+
+            UserId = userId;
+            ClaimType = claimType;
+            ClaimValue = claimValue;
+        }
+
+        /// <summary>
+        /// Creates a Claim instance from this entity.
+        /// </summary>
+        /// <returns></returns>
+        public virtual Claim ToClaim()
+        {
+            return new Claim(ClaimType, ClaimValue);
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUserLogin.cs b/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUserLogin.cs
new file mode 100644
index 0000000000..836fa99f9d
--- /dev/null
+++ b/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUserLogin.cs
@@ -0,0 +1,48 @@
+using JetBrains.Annotations;
+using Volo.Abp.Domain.Entities;
+
+namespace Volo.Abp.Identity
+{
+    /// <summary>
+    /// Represents a login and its associated provider for a user.
+    /// </summary>
+    public class IdentityUserLogin : Entity
+    {
+        /// <summary>
+        /// Gets or sets the of the primary key of the user associated with this login.
+        /// </summary>
+        public virtual string UserId { get; protected set; }
+
+        /// <summary>
+        /// Gets or sets the login provider for the login (e.g. facebook, google)
+        /// </summary>
+        public virtual string LoginProvider { get; protected set; }
+
+        /// <summary>
+        /// Gets or sets the unique provider identifier for this login.
+        /// </summary>
+        public virtual string ProviderKey { get; protected set; }
+
+        /// <summary>
+        /// Gets or sets the friendly name used in a UI for this login.
+        /// </summary>
+        public virtual string ProviderDisplayName { get; protected set; }
+
+        protected IdentityUserLogin()
+        {
+            
+        }
+
+        public IdentityUserLogin([NotNull] string userId, [NotNull] string loginProvider, [NotNull] string providerKey, string providerDisplayName)
+        {
+            Check.NotNull(userId, nameof(userId));
+            Check.NotNull(loginProvider, nameof(loginProvider));
+            Check.NotNull(providerKey, nameof(providerKey));
+
+            UserId = userId;
+            LoginProvider = loginProvider;
+            ProviderKey = providerKey;
+            ProviderDisplayName = providerDisplayName;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUserRole.cs b/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUserRole.cs
new file mode 100644
index 0000000000..8b332e82a4
--- /dev/null
+++ b/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUserRole.cs
@@ -0,0 +1,35 @@
+using JetBrains.Annotations;
+using Volo.Abp.Domain.Entities;
+
+namespace Volo.Abp.Identity
+{
+    /// <summary>
+    /// Represents the link between a user and a role.
+    /// </summary>
+    public class IdentityUserRole : Entity
+    {
+        /// <summary>
+        /// Gets or sets the primary key of the user that is linked to a role.
+        /// </summary>
+        public virtual string UserId { get; protected set; }
+
+        /// <summary>
+        /// Gets or sets the primary key of the role that is linked to the user.
+        /// </summary>
+        public virtual string RoleId { get; protected set; }
+
+        protected IdentityUserRole()
+        {
+            
+        }
+
+        public IdentityUserRole([NotNull] string userId, [NotNull] string roleId)
+        {
+            Check.NotNull(userId, nameof(userId));
+            Check.NotNull(roleId, nameof(roleId));
+
+            UserId = userId;
+            RoleId = roleId;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUserToken.cs b/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUserToken.cs
new file mode 100644
index 0000000000..4da14a23d6
--- /dev/null
+++ b/src/Volo.Abp.Identity/Volo/Abp/Identity/IdentityUserToken.cs
@@ -0,0 +1,48 @@
+using JetBrains.Annotations;
+using Volo.Abp.Domain.Entities;
+
+namespace Volo.Abp.Identity
+{
+    /// <summary>
+    /// Represents an authentication token for a user.
+    /// </summary>
+    public class IdentityUserToken : Entity
+    {
+        /// <summary>
+        /// Gets or sets the primary key of the user that the token belongs to.
+        /// </summary>
+        public virtual string UserId { get; protected set; }
+
+        /// <summary>
+        /// Gets or sets the LoginProvider this token is from.
+        /// </summary>
+        public virtual string LoginProvider { get; protected set; }
+
+        /// <summary>
+        /// Gets or sets the name of the token.
+        /// </summary>
+        public virtual string Name { get; protected set; }
+
+        /// <summary>
+        /// Gets or sets the token value.
+        /// </summary>
+        public virtual string Value { get; set; }
+
+        protected IdentityUserToken()
+        {
+            
+        }
+
+        public IdentityUserToken([NotNull] string userId, [NotNull] string loginProvider, [NotNull] string name, string value) //TODO: Can value be null?
+        {
+            Check.NotNull(userId, nameof(userId));
+            Check.NotNull(loginProvider, nameof(loginProvider));
+            Check.NotNull(name, nameof(name));
+
+            UserId = userId;
+            LoginProvider = loginProvider;
+            Name = name;
+            Value = value;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/Volo.Abp.Identity/project.json b/src/Volo.Abp.Identity/project.json
index 0ae87711b5..3e8b95a12e 100644
--- a/src/Volo.Abp.Identity/project.json
+++ b/src/Volo.Abp.Identity/project.json
@@ -3,7 +3,8 @@
 
   "dependencies": {
     "NETStandard.Library": "1.6.1",
-    "Microsoft.AspNetCore.Identity": "1.1.0"
+    "Microsoft.AspNetCore.Identity": "1.1.0",
+    "Volo.Abp": "1.0.0-*"
   },
 
   "frameworks": {
diff --git a/src/Volo.Abp/Volo/Abp/Domain/Entities/Entity.cs b/src/Volo.Abp/Volo/Abp/Domain/Entities/Entity.cs
index c7c8f29458..15c0971e46 100644
--- a/src/Volo.Abp/Volo/Abp/Domain/Entities/Entity.cs
+++ b/src/Volo.Abp/Volo/Abp/Domain/Entities/Entity.cs
@@ -4,14 +4,13 @@ using System.Reflection;
 
 namespace Volo.Abp.Domain.Entities
 {
-    //TODO: Think on Entity class without PK
-    ///// <summary>
-    ///// A shortcut of <see cref="Entity{TPrimaryKey}"/> for most used primary key type (<see cref="int"/>).
-    ///// </summary>
-    //public abstract class Entity : Entity<string>, IEntity<>
-    //{
-
-    //}
+    /// <summary>
+    /// A shortcut of <see cref="Entity{TPrimaryKey}"/> for default primary key type (<see cref="string"/>).
+    /// </summary>
+    public abstract class Entity : Entity<string>, IEntity
+    {
+
+    }
 
     /// <summary>
     /// Basic implementation of IEntity interface.
diff --git a/src/Volo.Abp/Volo/Abp/Domain/Entities/IEntity.cs b/src/Volo.Abp/Volo/Abp/Domain/Entities/IEntity.cs
index 309c810d2c..fd5f75287e 100644
--- a/src/Volo.Abp/Volo/Abp/Domain/Entities/IEntity.cs
+++ b/src/Volo.Abp/Volo/Abp/Domain/Entities/IEntity.cs
@@ -1,13 +1,12 @@
 namespace Volo.Abp.Domain.Entities
 {
-    //TODO: Think on Entity class without PK
-    ///// <summary>
-    ///// A shortcut of <see cref="IEntity{TPrimaryKey}"/> for most used primary key type (<see cref="int"/>).
-    ///// </summary>
-    //public interface IEntity : IEntity<int>
-    //{
+    /// <summary>
+    /// A shortcut of <see cref="IEntity{TPrimaryKey}"/> for default primary key type (<see cref="string"/>).
+    /// </summary>
+    public interface IEntity : IEntity<string>
+    {
 
-    //}
+    }
 
     /// <summary>
     /// Defines interface for base entity type. All entities in the system must implement this interface.