diff --git a/app/models/app.rb b/app/models/app.rb
new file mode 100644
index 0000000..d3e15e6
--- /dev/null
+++ b/app/models/app.rb
@@ -0,0 +1,4 @@
+class App < ActiveRecord::Base
+
+  validates :name, :package_name, presence: true
+end
diff --git a/app/models/batch_installation.rb b/app/models/batch_installation.rb
new file mode 100644
index 0000000..4f7e556
--- /dev/null
+++ b/app/models/batch_installation.rb
@@ -0,0 +1,3 @@
+class BatchInstallation < ActiveRecord::Base
+  belongs_to :app
+end
diff --git a/app/models/installation.rb b/app/models/installation.rb
new file mode 100644
index 0000000..d3d0a24
--- /dev/null
+++ b/app/models/installation.rb
@@ -0,0 +1,9 @@
+class Installation < ActiveRecord::Base
+  enum status: [:pushed, :downloaded, :cancelled, :installed]
+
+
+
+  belongs_to :device
+  belongs_to :batch_installation
+
+end
diff --git a/db/migrate/20151113123015_create_applications.rb b/db/migrate/20151113123015_create_applications.rb
new file mode 100644
index 0000000..61cc006
--- /dev/null
+++ b/db/migrate/20151113123015_create_applications.rb
@@ -0,0 +1,10 @@
+class CreateApplications < ActiveRecord::Migration
+  def change
+    create_table :applications do |t|
+      t.string :name
+      t.string :package_name
+
+      t.timestamps null: false
+    end
+  end
+end
diff --git a/db/migrate/20151113124226_rename_application_to_app.rb b/db/migrate/20151113124226_rename_application_to_app.rb
new file mode 100644
index 0000000..7e503b0
--- /dev/null
+++ b/db/migrate/20151113124226_rename_application_to_app.rb
@@ -0,0 +1,5 @@
+class RenameApplicationToApp < ActiveRecord::Migration
+  def change
+    rename_table :applications, :apps
+  end
+end
diff --git a/db/migrate/20151113131647_create_batch_installations.rb b/db/migrate/20151113131647_create_batch_installations.rb
new file mode 100644
index 0000000..b950f95
--- /dev/null
+++ b/db/migrate/20151113131647_create_batch_installations.rb
@@ -0,0 +1,9 @@
+class CreateBatchInstallations < ActiveRecord::Migration
+  def change
+    create_table :batch_installations do |t|
+      t.integer :app_id
+
+      t.timestamps null: false
+    end
+  end
+end
diff --git a/db/migrate/20151113132152_create_installations.rb b/db/migrate/20151113132152_create_installations.rb
new file mode 100644
index 0000000..6aaa6c9
--- /dev/null
+++ b/db/migrate/20151113132152_create_installations.rb
@@ -0,0 +1,11 @@
+class CreateInstallations < ActiveRecord::Migration
+  def change
+    create_table :installations do |t|
+      t.integer :device_id
+      t.integer :batch_installation_id
+      t.integer :status
+
+      t.timestamps null: false
+    end
+  end
+end
diff --git a/db/migrate/20151113140645_change_status_data_type_from_string_to_integer_in_installation.rb b/db/migrate/20151113140645_change_status_data_type_from_string_to_integer_in_installation.rb
new file mode 100644
index 0000000..f25cbd2
--- /dev/null
+++ b/db/migrate/20151113140645_change_status_data_type_from_string_to_integer_in_installation.rb
@@ -0,0 +1,5 @@
+class ChangeStatusDataTypeFromStringToIntegerInInstallation < ActiveRecord::Migration
+  def change
+    change_column :installations, :status, :integer
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 917add2..a56d2b8 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20151113095735) do
+ActiveRecord::Schema.define(version: 20151113140645) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -49,6 +49,19 @@ ActiveRecord::Schema.define(version: 20151113095735) do
   add_index "admin_users", ["email"], name: "index_admin_users_on_email", unique: true, using: :btree
   add_index "admin_users", ["reset_password_token"], name: "index_admin_users_on_reset_password_token", unique: true, using: :btree
 
+  create_table "apps", force: :cascade do |t|
+    t.string   "name"
+    t.string   "package_name"
+    t.datetime "created_at",   null: false
+    t.datetime "updated_at",   null: false
+  end
+
+  create_table "batch_installations", force: :cascade do |t|
+    t.integer  "app_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
   create_table "devices", force: :cascade do |t|
     t.string   "model"
     t.string   "unique_id"
@@ -69,5 +82,13 @@ ActiveRecord::Schema.define(version: 20151113095735) do
 
   add_index "heartbeats", ["device_id"], name: "index_heartbeats_on_device_id", using: :btree
 
+  create_table "installations", force: :cascade do |t|
+    t.integer  "device_id"
+    t.integer  "batch_installation_id"
+    t.integer  "status"
+    t.datetime "created_at",            null: false
+    t.datetime "updated_at",            null: false
+  end
+
   add_foreign_key "heartbeats", "devices"
 end
diff --git a/spec/factories/app.rb b/spec/factories/app.rb
new file mode 100644
index 0000000..25f9e7c
--- /dev/null
+++ b/spec/factories/app.rb
@@ -0,0 +1,7 @@
+FactoryGirl.define do
+  factory :app do
+    name "My Ultimate Application"
+    package_name "my.ultimate.application"
+  end
+
+end
diff --git a/spec/factories/batch_installations.rb b/spec/factories/batch_installations.rb
new file mode 100644
index 0000000..5bb7557
--- /dev/null
+++ b/spec/factories/batch_installations.rb
@@ -0,0 +1,6 @@
+FactoryGirl.define do
+  factory :batch_installation do
+    app_id 1
+  end
+
+end
diff --git a/spec/factories/installations.rb b/spec/factories/installations.rb
new file mode 100644
index 0000000..8795f38
--- /dev/null
+++ b/spec/factories/installations.rb
@@ -0,0 +1,8 @@
+FactoryGirl.define do
+  factory :installation do
+    device_id 1
+    batch_installation_id 1
+    status 1
+  end
+
+end
diff --git a/spec/models/app.rb b/spec/models/app.rb
new file mode 100644
index 0000000..cc86d18
--- /dev/null
+++ b/spec/models/app.rb
@@ -0,0 +1,11 @@
+require 'rails_helper'
+
+RSpec.describe App, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+
+  let!(:app) { create(:app) }
+
+  it { should validate_presence_of :name }
+  it { should validate_presence_of :package_name } 
+
+end
diff --git a/spec/models/batch_installation_spec.rb b/spec/models/batch_installation_spec.rb
new file mode 100644
index 0000000..f46af1e
--- /dev/null
+++ b/spec/models/batch_installation_spec.rb
@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe BatchInstallation, type: :model do
+  it {should belong_to(:app)}
+end
diff --git a/spec/models/installation_spec.rb b/spec/models/installation_spec.rb
new file mode 100644
index 0000000..d2fb891
--- /dev/null
+++ b/spec/models/installation_spec.rb
@@ -0,0 +1,32 @@
+require 'rails_helper'
+
+RSpec.describe Installation, type: :model do
+  it { should belong_to(:device) }
+  it { should belong_to(:batch_installation) }
+
+
+
+  # Create Installation Model [Device ID, batch installation ID, status(Pushed, Downloaded, Cancelled, Installed)]
+  describe "Installation status" do
+    let!(:installation){FactoryGirl.create(:installation)}
+    it "Pushed" do
+      installation.pushed!
+      expect(installation.status).to eql Installation.statuses.keys[0]
+    end
+    it "Downloaded" do
+      installation.downloaded!
+      expect(installation.status).to eql Installation.statuses.keys[1]
+    end
+    it "Cancelled" do
+      installation.cancelled!      
+      expect(installation.status).to eql Installation.statuses.keys[2]
+    end
+
+    it "Installed" do
+      installation.installed!
+      expect(installation.status).to eql Installation.statuses.keys[3]
+    end
+   
+  end
+
+end