diff --git a/app/models/user.rb b/app/models/user.rb
index 019c14d..d9eb568 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -9,8 +9,6 @@ class User < ActiveRecord::Base
   has_many :checklists, through: :assign_histories
   serialize :extra_info
 
-
-
   scope :generation_sorted_desc, -> { order(generation_id: :desc) }
   scope :responsed_to_notice, -> (notice) { joins(:responses).merge(Response.where(notice: notice)) }
   Response::STATUSES.each do |status|
@@ -22,7 +20,6 @@ class User < ActiveRecord::Base
       WHERE A.status is null}
   joins(SQL) }
 
-  scope :order_by_gid, -> {order(generation_id: :desc)}
   scope :order_by_responsed_at, -> {order('responses.created_at ASC')}
   scope :order_by_read_at, -> {order('read_activity_marks.created_at DESC')}
 
diff --git a/app/views/admin/messages/show.html.erb b/app/views/admin/messages/show.html.erb
index 3ed3ba6..33880f5 100644
--- a/app/views/admin/messages/show.html.erb
+++ b/app/views/admin/messages/show.html.erb
@@ -21,7 +21,7 @@
           </tr>
         </thead>
         <tbody>
-          <% @message.users.order_by_gid.each do |user| %>
+          <% @message.users.generation_sorted_desc.each do |user| %>
           <tr>
             <td class="text-right"><%= pretty_generation_id(user.generation_id) %></td>
             <td><%= user.username %></td>
diff --git a/spec/unit/models/user_spec.rb b/spec/unit/models/user_spec.rb
index 5c868e5..eb9ee74 100644
--- a/spec/unit/models/user_spec.rb
+++ b/spec/unit/models/user_spec.rb
@@ -25,8 +25,6 @@
     expect(user.phone_number).to eq("01012341234")
     expect(user.username).to eq("user name")
     expect(user.email).to eq("test @ test.com")
-
-
   end
 
   describe "#responsed_to?" do
@@ -41,34 +39,31 @@
     end
   end
 
-
-
   describe "#response_status" do
     context "user didn't response to notice" do
-      it "should return satus, users responsed to notice" do
+      it "should return status, users responsed to notice" do
         user = FactoryGirl.create(:user)
         notice = FactoryGirl.create(:notice)
 
         expect(user.response_status(notice)).to eq("not")
-
       end
     end
+
     context "user responsed 'go' to notice" do
       it "should return satus, users responsed to notice" do
         user = FactoryGirl.create(:user)
         notice = FactoryGirl.create(:notice)
         response = Response.create!(user: user, notice: notice, status: "go")
         expect(user.response_status(notice)).to eq("go")
-
       end
     end
+
     context "user responsed 'go' to notice but he/she had to be 'wait'" do
       it "should return satus, users responsed to notice" do
         user = FactoryGirl.create(:user)
         notice = FactoryGirl.create(:notice)
         response = Response.create!(user: user, notice: notice, status: "wait")
         expect(user.response_status(notice)).to eq("wait")
-
       end
     end
   end
@@ -100,4 +95,85 @@
     end
   end
 
+  describe "#generation_sorted_desc" do
+    it "should sort generation descending" do
+      user1 = FactoryGirl.create(:user, generation_id: 1)
+      user2 = FactoryGirl.create(:user, generation_id: 3)
+      user3 = FactoryGirl.create(:user, generation_id: 2)
+
+      expect(User.generation_sorted_desc).to eq([user2, user3, user1])
+    end
+  end
+
+  describe "#responsed_to_notice" do
+    it "should fetch who responsed to notice" do
+      notice1 = FactoryGirl.create(:notice)
+      notice2 = FactoryGirl.create(:notice)
+
+      user = FactoryGirl.create(:user)
+      Response.create!(user: user, notice: notice1, status: "yes")
+
+      expect(User.responsed_to_notice(notice1)).to contain_exactly(user)
+      expect(User.responsed_to_notice(notice2)).to be_empty
+    end
+  end
+
+  describe "#responsed_[Response::STATUSES]" do
+    it "should fetch who responsed to notice with given status" do
+      notice1 = FactoryGirl.create(:notice)
+      user1 = FactoryGirl.create(:user)
+      user2 = FactoryGirl.create(:user)
+      user3 = FactoryGirl.create(:user)
+
+      Response.create!(user: user1, notice: notice1, status: "yes")
+      Response.create!(user: user2, notice: notice1, status: "no")
+      Response.create!(user: user3, notice: notice1, status: "yes")
+
+      expect(User.responsed_yes(notice1)).to contain_exactly(user1, user3)
+      expect(User.responsed_no(notice1)).to contain_exactly(user2)
+    end
+  end
+
+  describe "#responsed_not_to_notice" do
+    it "should fetch who did not response to notice" do
+      notice1 = FactoryGirl.create(:notice)
+      notice2 = FactoryGirl.create(:notice)
+
+      user = FactoryGirl.create(:user)
+      Response.create!(user: user, notice: notice1, status: "yes")
+
+      expect(User.responsed_not_to_notice(notice1)).to be_empty
+      expect(User.responsed_not_to_notice(notice2)).to contain_exactly(user)
+    end
+  end
+
+  describe "#order_by_responsed_at" do
+    it "should sort responsed_at ascending" do
+      notice1 = FactoryGirl.create(:notice)
+      user1 = FactoryGirl.create(:user)
+      user2 = FactoryGirl.create(:user)
+      user3 = FactoryGirl.create(:user)
+
+      Response.create!(user: user1, notice: notice1, status: "yes")
+      Response.create!(user: user3, notice: notice1, status: "yes")
+      Response.create!(user: user2, notice: notice1, status: "yes")
+
+      expect(User.responsed_yes(notice1).order_by_responsed_at).to eq([user1, user3, user2])
+    end
+  end
+
+  describe "#order_by_read_at" do
+    it "should sort read_at descending" do
+      notice1 = FactoryGirl.create(:notice)
+      user1 = FactoryGirl.create(:user)
+      user2 = FactoryGirl.create(:user)
+      user3 = FactoryGirl.create(:user)
+
+      user1.read!(notice1)
+      user3.read!(notice1)
+      user2.read!(notice1)
+
+      expect(notice1.readers.order_by_read_at).to eq([user2, user3, user1])
+    end
+  end
 end
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