diff --git a/lab2/contact.rb b/lab2/contact.rb
index e20c619..caaf745 100644
--- a/lab2/contact.rb
+++ b/lab2/contact.rb
@@ -16,6 +16,10 @@ class Contact
     @email = email
   end
 
+  def present?
+    @phone || @telegram || @email
+  end
+
   def info
     return "Phone: #{@phone}" if @phone
     return "Telegram: #{@telegram}" if @telegram
diff --git a/lab2/person.rb b/lab2/person.rb
index 3a6fdad..0e17ac3 100644
--- a/lab2/person.rb
+++ b/lab2/person.rb
@@ -1,15 +1,16 @@
 require_relative 'contact'
 
 class Person
-  attr_accessor :id, :git
-  attr_reader :contact
+  attr_reader :id, :git, :contact
 
   def initialize(id:, git:, contact: Contact.new)
+    validate_id(id)
+    validate_git(git)
+    validate_contact(contact)
+
     @id = id
     @git = git
     @contact = contact
-
-    validate_person
   end
 
   def git_present?
@@ -34,9 +35,17 @@ class Person
 
   private
 
-  def validate_person
-    raise ArgumentError, 'ID is required and must be a non-empty string' unless self.class.valid_id?(@id)
-    raise ArgumentError, 'Git link is required' unless git_present?
-    raise ArgumentError, 'Invalid Git link format' unless self.class.valid_git?(@git)
+  def validate_id(id)
+    raise ArgumentError, 'ID is required and must be a non-empty string' unless self.class.valid_id?(id)
+  end
+
+  def validate_git(git)
+    raise ArgumentError, 'Git link is required' if git.nil? || git.strip.empty?
+    raise ArgumentError, 'Invalid Git link format' unless self.class.valid_git?(git)
+  end
+
+  def validate_contact(contact)
+    raise ArgumentError, 'Contact must be a valid Contact object' unless contact.is_a?(Contact)
+    raise ArgumentError, 'Contact must have at least one valid field' unless contact.present?
   end
 end
diff --git a/lab2/student_short.rb b/lab2/student_short.rb
index 3596d24..6801b1f 100644
--- a/lab2/student_short.rb
+++ b/lab2/student_short.rb
@@ -13,25 +13,25 @@ class StudentShort < Person
       id: student.id,
       git: student.git,
       surname_initials: student.surname_and_initials,
-      contact: student.contact_info
+      contact: student.contact
     )
   end
 
   def self.from_string(id, info_string)
     parts = info_string.split(',').map(&:strip)
     raise ArgumentError, 'Invalid info string format' if parts.size < 3
-  
+
     surname_initials = parts[0]
     git = parts[1].split(': ').last.strip
     contact_string = parts[2].split(': ', 2).last.strip
-  
+
     contact = Contact.new_from_info(contact_string)
-  
+
     new(
       id: id,
       git: git,
       surname_initials: surname_initials,
-      contact: contact.info
+      contact: contact
     )
   end