diff --git a/Gemfile b/Gemfile
index f466cf3..f04db6c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -26,6 +26,8 @@ gem 'bcrypt', '~> 3.1.7'
 # Reduces boot times through caching; required in config/boot.rb
 gem 'bootsnap', '>= 1.4.2', require: false
 
+gem 'state_machines-activerecord'
+
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console
   gem 'byebug', platforms: %i[mri mingw x64_mingw]
diff --git a/Gemfile.lock b/Gemfile.lock
index f2b0a88..41da6db 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -186,6 +186,13 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
+    state_machines (0.5.0)
+    state_machines-activemodel (0.7.1)
+      activemodel (>= 4.1)
+      state_machines (>= 0.5.0)
+    state_machines-activerecord (0.6.0)
+      activerecord (>= 4.1)
+      state_machines-activemodel (>= 0.5.0)
     thor (1.0.1)
     thread_safe (0.3.6)
     tilt (2.0.10)
@@ -229,6 +236,7 @@ DEPENDENCIES
   rubocop
   sass-rails (>= 6)
   selenium-webdriver
+  state_machines-activerecord
   web-console (>= 3.3.0)
   webdrivers
   webpacker (~> 4.0)
diff --git a/app/models/task.rb b/app/models/task.rb
index 3c23424..c11d709 100644
--- a/app/models/task.rb
+++ b/app/models/task.rb
@@ -1,2 +1,43 @@
 class Task < ApplicationRecord
+  belongs_to :author, class_name: 'User'
+  belongs_to :assignee, class_name: 'User', optional: true
+
+  validates :name, presence: true
+  validates :description, presence: true
+  validates :author, presence: true
+  validates :description, length: { maximum: 500 }
+
+  state_machine initial: :new_task do
+    state :new_task
+    state :in_development
+    state :in_qa
+    state :in_codereview
+    state :ready_for_release
+    state :released
+    state :archived
+
+    event :develop do
+      transition %i[new_task in_qa in_codereview] => :in_development
+    end
+
+    event :qa do
+      transition in_development: :in_qa
+    end
+
+    event :codereview do
+      transition in_qa: :in_codereview
+    end
+
+    event :reviwed do
+      transition in_codereview: :ready_for_release
+    end
+
+    event :release do
+      transition ready_for_release: :released
+    end
+
+    event :archive do
+      transition %i[new_task released] => :archived
+    end
+  end
 end
diff --git a/app/models/user.rb b/app/models/user.rb
index d67da20..b677190 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -1,3 +1,9 @@
 class User < ApplicationRecord
   has_secure_password
+  has_many :my_tasks, class_name: 'Task', foreign_key: :author_id
+  has_many :assigned_tasks, class_name: 'Task', foreign_key: :assignee_id
+
+  validates :first_name, presence: true, length: { minimum: 2 }
+  validates :last_name, presence: true, length: { minimum: 2 }
+  validates :email, presence: true, uniqueness: true, format: { with: /\w*@{1}\w*/ }
 end
diff --git a/test/factories/tasks.rb b/test/factories/tasks.rb
index 62ed71a..0edf259 100644
--- a/test/factories/tasks.rb
+++ b/test/factories/tasks.rb
@@ -2,9 +2,10 @@
   factory :task do
     name
     description
-    author_id { 1 }
-    assignee_id { 1 }
     state
     expired_at
+
+    association :author, factory: :manager
+    association :assignee, factory: :developer
   end
 end