diff --git a/lib/grader_script.rb b/lib/grader_script.rb
--- a/lib/grader_script.rb
+++ b/lib/grader_script.rb
@@ -1,35 +1,58 @@
 module GraderScript
 
   def self.grader_control_enabled?
-    if defined? GRADER_SCRIPT_DIR
-      GRADER_SCRIPT_DIR != ''
+    if defined? GRADER_ROOT_DIR
+      GRADER_ROOT_DIR != ''
     else
       false
     end
   end
 
-  def self.stop_grader(pid)
+  def self.raw_dir
+    File.join GRADER_ROOT_DIR, "raw"
+  end
+
+  def self.call_grader(params)
     if GraderScript.grader_control_enabled?
-      cmd = "#{GRADER_SCRIPT_DIR}/grader stop #{pid}"
+      cmd = File.join(GRADER_ROOT_DIR, "scripts/grader") + " " + params
       system(cmd)
     end
   end
 
+  def self.stop_grader(pid)
+    GraderScript.call_grader "stop #{pid}"
+  end
+
   def self.stop_graders(pids)
-    if GraderScript.grader_control_enabled?
-      pid_str = (pids.map { |process| process.pid.to_a }).join ' '
-      cmd = "#{GRADER_SCRIPT_DIR}/grader stop " + pid_str
-      system(cmd)
-    end
+    pid_str = (pids.map { |process| process.pid.to_a }).join ' '
+    GraderScript.call_grader "stop #{pid_str}"
   end
 
   def self.start_grader(env)
+    GraderScript.call_grader "#{env} queue &"
+    GraderScript.call_grader "#{env} test_request &"
+  end
+
+  def self.call_import_problem(problem_name, 
+                               problem_dir,
+                               time_limit=1,
+                               memory_limit=32,
+                               checker_name='text')
     if GraderScript.grader_control_enabled?
-      cmd = "#{GRADER_SCRIPT_DIR}/grader #{env} queue &"
-      system(cmd)
-      cmd = "#{GRADER_SCRIPT_DIR}/grader #{env} test_request &"
-      system(cmd)
-    end    
+      cur_dir = `pwd`.chomp
+      Dir.chdir(GRADER_ROOT_DIR)
+
+      script_name = File.join(GRADER_ROOT_DIR, "scripts/import_problem")
+      cmd = "#{script_name} #{problem_name} #{problem_dir} #{checker_name}" +
+        " -t #{time_limit} -m #{memory_limit}"
+
+      output = `#{cmd}`
+
+      Dir.chdir(cur_dir)
+      
+      return output
+    end
+    return ''
   end
 
 end