diff --git a/lib/pair_programming23_study.rb b/lib/pair_programming23_study.rb
index 529e5c16..840648d4 100644
--- a/lib/pair_programming23_study.rb
+++ b/lib/pair_programming23_study.rb
@@ -11,6 +11,8 @@ class PairProgramming23Study
   def self.participate_in_pp?(user, exercise)
     # All easy tasks of the first week to be solved by the participants on their own
     if experiment_course?(user.current_study_group_id) && [636, 647, 648, 649, 637, 638, 623, 639, 650, 625, 624, 651, 653, 654, 655, 664, 656].exclude?(exercise.id)
+      return true if fixed_enrolled_users.include? [user.consumer_id.to_s, user.external_id]
+
       user_group = user.id % 3 # => 0, 1, 2
       case user_group
         when 0, 1
@@ -25,4 +27,16 @@ class PairProgramming23Study
   def self.experiment_course?(study_group_id)
     STUDY_GROUP_IDS.include? study_group_id
   end
+
+  def self.csv
+    @csv ||= CSV.read(Rails.root.join('config/pair_programming23_study.csv'), headers: true)
+  rescue Errno::ENOENT
+    []
+  end
+
+  def self.fixed_enrolled_users
+    @fixed_enrolled_users ||= csv.map do |row|
+      [row['consumer_id'], row['external_id']]
+    end
+  end
 end