diff --git a/app/models/deliverable.rb b/app/models/deliverable.rb
index 2e018c2..019aa73 100644
--- a/app/models/deliverable.rb
+++ b/app/models/deliverable.rb
@@ -313,6 +313,30 @@ class Deliverable < ActiveRecord::Base
     labor.to_f + overhead.to_f
   end
 
+  # Array of users who have logged billable time to the deliverable
+  def users_with_billable_time
+    users_with_time(true)
+  end
+
+  # Array of users who have logged non-billable time to the deliverable
+  def users_with_non_billable_time
+    users_with_time(false)
+  end
+
+  # Array of users who have logged a type of time to the deliverable
+  #
+  # @params billable_time_only Boolean Only count billable (true) or non-billable (false) time
+  def users_with_time(billable_time_only)
+    time_entries = project.time_entries.all(:conditions => ["#{TimeEntry.table_name}.issue_id IN (?)", issue_ids])
+
+    time_entries.inject([]) do |users, time_entry|
+      if time_entry.billable? == billable_time_only
+        users << time_entry.user unless users.include?(time_entry.user)
+      end
+      users
+    end
+  end
+
   def self.valid_types
     ['FixedDeliverable','HourlyDeliverable','RetainerDeliverable']
   end
diff --git a/test/unit/deliverable_test.rb b/test/unit/deliverable_test.rb
index ed48aaa..62f08e7 100644
--- a/test/unit/deliverable_test.rb
+++ b/test/unit/deliverable_test.rb
@@ -186,4 +186,62 @@ class DeliverableTest < ActiveSupport::TestCase
     
   end
 
+  context "#users_with_billable_time" do
+    setup do
+      configure_overhead_plugin
+      create_contract_and_deliverable
+      create_issue_with_time_for_deliverable(@deliverable, {
+                                               :activity => @billable_activity,
+                                               :user => @manager
+                                             })
+      create_issue_with_time_for_deliverable(@deliverable, {
+                                               :activity => @non_billable_activity,
+                                               :user => @manager
+                                             })
+      @non_billable_user = User.generate!
+      create_issue_with_time_for_deliverable(@deliverable, {
+                                               :activity => @non_billable_activity,
+                                               :user => @non_billable_user
+                                             })
+
+    end
+    
+    should "include users with billable Time Entries" do
+      assert @deliverable.users_with_billable_time.include?(@manager), "Manager not included"
+    end
+    
+    should "not include users with only nonbillable Time Entries" do
+      assert !@deliverable.users_with_billable_time.include?(@non_billable_user), "Non billable user included"
+    end
+  end
+  
+  context "#users_with_non_billable_time" do
+    setup do
+      configure_overhead_plugin
+      create_contract_and_deliverable
+      create_issue_with_time_for_deliverable(@deliverable, {
+                                               :activity => @billable_activity,
+                                               :user => @manager
+                                             })
+      create_issue_with_time_for_deliverable(@deliverable, {
+                                               :activity => @non_billable_activity,
+                                               :user => @manager
+                                             })
+      @billable_user = User.generate!
+      create_issue_with_time_for_deliverable(@deliverable, {
+                                               :activity => @billable_activity,
+                                               :user => @billable_user
+                                             })
+
+    end
+    
+    should "include users with billable Time Entries" do
+      assert @deliverable.users_with_non_billable_time.include?(@manager), "Manager not included"
+    end
+    
+    should "not include users with only nonbillable Time Entries" do
+      assert !@deliverable.users_with_non_billable_time.include?(@billable_user), "Billable user included"
+    end
+  end
+
 end