diff --git a/judge/scripts/lib/configuration.rb b/judge/scripts/lib/configuration.rb
new file mode 100644
--- /dev/null
+++ b/judge/scripts/lib/configuration.rb
@@ -0,0 +1,84 @@
+module Grader
+
+  # This singleton class holds basic configurations for grader.  When
+  # running in each mode, grader uses resources from different
+  # directories and outputs differently.  Usually the attributes name
+  # are descriptive; below we explain more on each attributes.
+  class Configuration
+    # Rails' environment: "development", "production"
+    attr_accessor :rails_env
+
+    # Grader looks for problem [prob] in problem_dir/[prob], and store
+    # execution results for submission [x] of user [u] in directory
+    # user_result_dir/[u]/[x]
+    attr_accessor :problems_dir
+    attr_accessor :user_result_dir
+
+    # If report_grader=true, the grader would add a row in model
+    # GraderProcess.  It would report itself with grader_hostname and
+    # process id.
+    attr_accessor :report_grader
+    attr_accessor :grader_hostname    
+
+    # If talkative=true, grader would report status to console.  If
+    # logging=true, grader would report status to a log file located
+    # in log_dir, in a file name mode.options.pid.  TODO: defined
+    # log file naming.
+    attr_accessor :talkative
+    attr_accessor :logging
+    attr_accessor :log_dir
+
+    # These are directories related to the test interface.
+    attr_accessor :test_request_input_base_dir
+    attr_accessor :test_request_output_base_dir
+    attr_accessor :test_request_problem_templates_dir
+
+    # Comment received from the grading script will be filtered
+    # through Configuration#report_comment.  How this method behave
+    # depends on this option; right now only two formats, :short and
+    # :long
+    attr_accessor :comment_report_style
+
+    def report_comment(comment)
+      case comment_report_style
+      when :short
+        if comment.chomp =~ /^[\[\]P]+$/    # all P's
+          'passed'
+        elsif comment.chomp =~ /[Cc]ompil.*[Ee]rror/
+          'compilation error'
+        else
+          'failed'
+        end
+        
+      when :full
+        comment.chomp
+      end
+    end
+
+    # Codes for singleton
+    private_class_method :new
+
+    @@instance = nil
+
+    def self.get_instance
+      if @@instance==nil
+        @@instance = new
+      end
+      @@instance
+    end
+    
+    private
+    def initialize
+      @talkative = false
+      @log_file = nil
+      @report_grader = false
+      @grader_hostname = `hostname`.chomp
+
+      @rails_env = 'development'
+      
+      @comment_report_style = :full
+    end
+
+  end
+
+end