diff --git a/judge/scripts/lib/runner.rb b/judge/scripts/lib/runner.rb
new file mode 100644
--- /dev/null
+++ b/judge/scripts/lib/runner.rb
@@ -0,0 +1,58 @@
+#
+# A runner drives the engine into various tasks.
+# 
+
+module Grader
+
+  class Runner
+
+    def initialize(engine, grader_process=nil)
+      @engine = engine
+      @grader_process = grader_process
+    end
+
+    def grade_oldest_task
+      task = Task.get_inqueue_and_change_status(Task::STATUS_GRADING)
+      if task!=nil 
+        @grader_process.report_active(task) if @grader_process!=nil
+        
+        submission = Submission.find(task.submission_id)
+        @engine.grade(submission)
+        task.status_complete!
+        @grader_process.report_inactive(task) if @grader_process!=nil
+      end
+      return task
+    end
+
+    def grade_problem(problem)
+      users = User.find(:all)
+      users.each do |u|
+        puts "user: #{u.login}"
+        last_sub = Submission.find_last_by_user_and_problem(u.id,problem.id)
+        if last_sub!=nil
+          @engine.grade(last_sub)
+        end
+      end
+    end
+
+    def grade_submission(submission)
+      puts "Submission: #{submission.id} by #{submission.user.full_name}"
+      @engine.grade(submission)
+    end
+
+    def grade_oldest_test_request
+      test_request = TestRequest.get_inqueue_and_change_status(Task::STATUS_GRADING)
+      if test_request!=nil 
+        @grader_process.report_active(test_request) if @grader_process!=nil
+        
+        @engine.grade(test_request)
+        test_request.status_complete!
+        @grader_process.report_inactive(test_request) if @grader_process!=nil
+      end
+      return test_request
+    end
+
+  end
+
+end
+