diff --git a/lib/kgrader.rb b/lib/kgrader.rb
index de89b03..b34a778 100644
--- a/lib/kgrader.rb
+++ b/lib/kgrader.rb
@@ -1,4 +1,5 @@
 require_relative 'kgrader/assignment'
+require_relative 'kgrader/backend'
 require_relative 'kgrader/cli'
 require_relative 'kgrader/course'
 require_relative 'kgrader/errors'
diff --git a/lib/kgrader/assignment.rb b/lib/kgrader/assignment.rb
index ee22e50..ee6544f 100644
--- a/lib/kgrader/assignment.rb
+++ b/lib/kgrader/assignment.rb
@@ -11,5 +11,9 @@ module KGrader
     rescue FilesystemError
       raise AssignmentError, "unknown assignment: #{name}"
     end
+
+    def id
+      @config['id'] || @name
+    end
   end
 end
diff --git a/lib/kgrader/backend.rb b/lib/kgrader/backend.rb
new file mode 100644
index 0000000..ec73045
--- /dev/null
+++ b/lib/kgrader/backend.rb
@@ -0,0 +1 @@
+require_relative 'backend/svn'
diff --git a/lib/kgrader/backend/svn.rb b/lib/kgrader/backend/svn.rb
new file mode 100644
index 0000000..e6142b6
--- /dev/null
+++ b/lib/kgrader/backend/svn.rb
@@ -0,0 +1,17 @@
+module KGrader::Backend
+  class SVN
+
+    def initialize(filesystem, config)
+      @fs = filesystem
+      @config = config
+    end
+
+    def fetch(semester, assignment, student)
+      url = @config['url'] % {
+        :semester => semester, :assignment => assignment, :student => student }
+
+      # TODO
+      puts "[fetching #{student}: #{url}]"
+    end
+  end
+end
diff --git a/lib/kgrader/course.rb b/lib/kgrader/course.rb
index 1492de8..06ef294 100644
--- a/lib/kgrader/course.rb
+++ b/lib/kgrader/course.rb
@@ -1,12 +1,14 @@
 module KGrader
   class Course
-    attr_reader :name
+    attr_reader :name, :backend
 
     def initialize(filesystem, name)
       @fs = filesystem
       @name = name
 
       @config = @fs.load @fs.course_config(@name)
+      type = @config['backend']
+      @backend = KGrader::backend(type).new self, @config[type]
       @rosters = {}
       @assignments = {}
     rescue FilesystemError
diff --git a/lib/kgrader/task.rb b/lib/kgrader/task.rb
index f05a195..c7d7179 100644
--- a/lib/kgrader/task.rb
+++ b/lib/kgrader/task.rb
@@ -19,11 +19,17 @@ module KGrader
       regrade = options.fetch(:regrade, false)
 
       # TODO
-      puts "Grading #{@course.name}:#{@semester} assignment #{@assignment.name}..."
-      puts "- students: #{students.inspect}"
-      puts "- due:      #{due}"
-      puts "- fetch:    #{fetch}"
-      puts "- regrade:  #{regrade}"
+      puts "[grading]"
+      puts "course     => #{@course.name}"
+      puts "semester   => #{@semester}"
+      puts "assignment => #{@assignment.name}"
+      puts "students   => #{students.join ', '}"
+      puts "due        => #{due}"
+      puts "fetch      => #{fetch}"
+      puts "regrade    => #{regrade}"
+      puts
+
+      fetch_students students if fetch
     end
 
     def commit(options = {})
@@ -31,8 +37,18 @@ module KGrader
       students &= options[:students] unless options[:students].nil?
 
       # TODO
-      puts "Committing #{@course.name}:#{@semester} assignment #{@assignment.name}..."
-      puts "- students: #{students.inspect}"
+      puts "[committing]"
+      puts "course     => #{@course.name}"
+      puts "semester   => #{@semester}"
+      puts "assignment => #{@assignment.name}"
+      puts "students   => #{students.join ', '}"
+    end
+
+    private
+    def fetch_students(students)
+      students.each do |student|
+        @course.backend.fetch @semester, @assignment.id, student
+      end
     end
   end
 end
diff --git a/lib/kgrader/util.rb b/lib/kgrader/util.rb
index 0280377..419ef34 100644
--- a/lib/kgrader/util.rb
+++ b/lib/kgrader/util.rb
@@ -33,6 +33,15 @@ module KGrader
     return args, options
   end
 
+  def self.backend(type)
+    case type
+    when 'svn'
+      Backend::SVN
+    else
+      raise ConfigError, "unknown backend: #{type}"
+    end
+  end
+
   def self.current_semester(format)
     season = Time.now.strftime('%m').to_i <= 6 ? 'sp' : 'fa'
     case format
diff --git a/spec/cs241h b/spec/cs241h
index 3c6f5d0..438e509 160000
--- a/spec/cs241h
+++ b/spec/cs241h
@@ -1 +1 @@
-Subproject commit 3c6f5d050d8a66de6b3c36ce1985c225700a5c2f
+Subproject commit 438e509e4c9097894f275dd66a5ae37bbcb62c24