diff --git a/plugins/stoa/lib/ext/profile_suggestion.rb b/plugins/stoa/lib/ext/profile_suggestion.rb
new file mode 100644
index 0000000..010c0ec
--- /dev/null
+++ b/plugins/stoa/lib/ext/profile_suggestion.rb
@@ -0,0 +1,35 @@
+require_dependency 'profile_suggestion'
+
+class ProfileSuggestion
+
+  CATEGORIES.merge!({:common_classroom => _('Classroom in common')})
+
+  RULES += %w[
+    people_with_common_classroom
+  ]
+
+  def self.people_with_common_classroom(person)
+    usp_id = person.usp_id
+    return if usp_id.nil?
+    person_attempts = 0
+    StoaPlugin::UspAlunoTurmaGrad.classrooms_from_person(usp_id).each do |classroom|
+      person_attempts += 1
+      return unless person.profile_suggestions.count < N_SUGGESTIONS && person_attempts < MAX_ATTEMPTS
+      StoaPlugin::UspAlunoTurmaGrad.find_all_by_codtur(classroom.codtur).each do |same_class|
+        classmate = Person.find_by_usp_id(same_class.codpes)
+        unless classmate.nil? || classmate == person || classmate.is_a_friend?(person) || person.already_request_friendship?(classmate)
+          suggestion = person.profile_suggestions.find_or_initialize_by_suggestion_id(classmate.id)
+          suggestion.common_classroom = 1
+          suggestion.save
+        end
+      end
+    end
+  end
+
+  def self.people_with_common_discipline(person)
+    person_attempts = 0
+    person_attempts += 1
+    return unless person.profile_suggestions.count < N_SUGGESTIONS && person_attempts < MAX_ATTEMPTS
+  end
+
+end
diff --git a/plugins/stoa/lib/stoa_plugin/usp_aluno_turma_grad.rb b/plugins/stoa/lib/stoa_plugin/usp_aluno_turma_grad.rb
new file mode 100644
index 0000000..5fc84fe
--- /dev/null
+++ b/plugins/stoa/lib/stoa_plugin/usp_aluno_turma_grad.rb
@@ -0,0 +1,14 @@
+class StoaPlugin::UspAlunoTurmaGrad < ActiveRecord::Base
+
+  establish_connection(:stoa)
+  set_table_name('alunoturma_gr')
+
+  def self.exists?(usp_id)
+    StoaPlugin::UspUser.find_by_codpes(usp_id.to_i)
+  end
+
+  def self.classrooms_from_person(usp_id)
+    StoaPlugin::UspAlunoTurmaGrad.find_all_by_codpes(usp_id)
+  end
+
+end
--
libgit2 0.21.2