diff --git a/lib/kgrader/assignment.rb b/lib/kgrader/assignment.rb
index 66c227a..f66dd20 100644
--- a/lib/kgrader/assignment.rb
+++ b/lib/kgrader/assignment.rb
@@ -25,7 +25,9 @@ module KGrader
     end
 
     def tests
-      @config['grade']
+      @tests ||= @config['grade'].map do |it|
+        { :name => it.keys.first, :max => it.values.first }
+      end
     end
 
     def report
@@ -33,12 +35,16 @@ module KGrader
     end
 
     def commit_message(student)
-      default = "adding grade report for #{name}: {student}"
-      template = @config['commit']['message'].clone || default
+      default = "Adding grade report for #{title}: {student}"
+      template = (@config['commit']['message'] || default).clone
       template['{student}'] = student
       template
     end
 
+    def extra_comments
+      @config['commit']['comments'] || []
+    end
+
     private
     def verify_config
       %w(stage build grade).each do |key|
@@ -59,5 +65,9 @@ module KGrader
 
       { :provided => provided, :graded => graded }
     end
+
+    def title
+      @config['title'] || @name
+    end
   end
 end
diff --git a/lib/kgrader/filesystem.rb b/lib/kgrader/filesystem.rb
index 0d8f3a8..ca277e8 100644
--- a/lib/kgrader/filesystem.rb
+++ b/lib/kgrader/filesystem.rb
@@ -77,7 +77,8 @@ module KGrader
       Dir[File.join desk_dir, '*', '*', '*', '*', 'status.txt'].each do |fn|
         File.write fn, "ungraded" if File.read(fn) == "graded"
       end
-      FileUtils.rm_rf Dir[File.join desk_dir, '*', '*', '*', '*', 'pending']
+      FileUtils.rm_f Dir[File.join desk_dir, '*', '*', '*', '*', 'pending']
+      FileUtils.rm_f Dir[File.join desk_dir, '*', '*', '*', '*', '*.log']
     end
 
     # -------------------------------------------------------------------------
diff --git a/lib/kgrader/jail.rb b/lib/kgrader/jail.rb
index 98207f5..4e7f729 100644
--- a/lib/kgrader/jail.rb
+++ b/lib/kgrader/jail.rb
@@ -17,13 +17,16 @@ module KGrader
       FileUtils.cp source, File.join(@root, target)
     end
 
-    def exec(command)
+    def exec(command, logpath)
       pid = Process.fork do
+        fp = File.open(logpath, 'w+')
         Dir.chdir @root
         # TODO: rlimit in exec, umask?
-        Process.exec command
+        Process.exec command, :in => :close, :out => fp, :err => fp,
+          :close_others => true
       end
       Process.waitpid pid, 0
+      $?.exited? && $?.exitstatus == 0
     end
   end
 end
diff --git a/lib/kgrader/submission.rb b/lib/kgrader/submission.rb
index edad216..43d2841 100644
--- a/lib/kgrader/submission.rb
+++ b/lib/kgrader/submission.rb
@@ -48,14 +48,13 @@ module KGrader
     end
 
     def grade
-      self.status = :ungraded
+      grade_prep
       stage
       build
       test
       save
-      # self.status = :graded  # UNCOMMENT
-      # @fs.jail.reset         # UNCOMMENT
-      # TODO: return grade summary string
+      grade_post
+      @summary
     end
 
     def commit
@@ -85,6 +84,14 @@ module KGrader
       File.join @root, 'pending'
     end
 
+    def buildlog
+      File.join @root, 'build.log'
+    end
+
+    def testlog
+      File.join @root, 'test.log'
+    end
+
     def revision
       @course.backend.revision repo
     end
@@ -101,10 +108,23 @@ module KGrader
       rev
     end
 
-    def stage
+    def grade_prep
+      @failure = false
+      @comments = []
+      @summary = nil
+      @tests = []
+
+      self.status = :ungraded
+      FileUtils.rm_f [buildlog, testlog]
       @fs.jail.reset
       @fs.jail.init
 
+      @assignment.tests.each do |test|
+        @tests.push({ :name => test[:name], :max => test[:max], :score => 0 })
+      end
+    end
+
+    def stage
       @assignment.manifest[:provided].each do |entry|
         @fs.jail.stage entry[:path], entry[:name]
       end
@@ -115,19 +135,63 @@ module KGrader
 
     def build
       @assignment.build_steps.each do |command|
-        @fs.jail.exec command
+        return build_failure unless @fs.jail.exec command, buildlog
       end
     end
 
     def test
-      @assignment.tests.each do |script|
-        # TODO: execute script in jail
+      return if @failure
+      @assignment.tests.each do |test|
+        # TODO: execute script in jail and update @test/@comments; out testlog
       end
     end
 
     def save
-      # TODO: save gradefile
+      File.write gradefile, generate_report
       FileUtils.touch pendingfile
     end
+
+    def grade_post
+      # self.status = :graded  # TODO: uncomment
+      # @fs.jail.reset  # TODO: uncomment
+      @summary = generate_summary unless @summary
+    end
+
+    def build_failure
+      @failure = true
+      @comments.push "failed to compile"
+      @summary = "#{format_points 0, max_score}: failed to compile"
+    end
+
+    def generate_report
+      # TODO
+      @tests
+      @assignment.extra_comments
+    end
+
+    def generate_summary
+      tests = @tests.each do |test|
+        "#{test[:score].to_s.rjust get_span(test[:max])}/#{test[:max]}"
+      end.join ', '
+      "#{format_points score, max_score}: #{tests}"
+    end
+
+    def score
+      @tests.reduce(0) { |sum, t| sum + t[:score] }
+    end
+
+    def max_score
+      @tests.reduce(0) { |sum, t| sum + t[:max] }
+    end
+
+    def format_points(score, max)
+      percent = (score.to_f * 100 / max).round.to_s.rjust 3
+      span = get_span max
+      "#{percent}% (#{score.to_s.rjust span}/#{max.to_s.rjust span})"
+    end
+
+    def get_span(max)
+      (Math.log10(max) + 1).to_i
+    end
   end
 end