diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright (c)2012, Masahiro Sakai
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Ryan R. Newton nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/OptDir.cabal b/OptDir.cabal
new file mode 100644
--- /dev/null
+++ b/OptDir.cabal
@@ -0,0 +1,22 @@
+Name:           OptDir
+Version:        0.0.1
+Cabal-Version:  >= 1.8
+License:        BSD3
+License-file:   LICENSE
+Author:         Masahiro Sakai
+Maintainer:     Masahiro Sakai <masahiro.sakai@gmail.com>
+Category:       Data, Optimization, Optimisation
+Synopsis:       The OptDir type for representing optimization directions.
+Description:    The OptDir type for representing optimization directions.
+Stability:      stable
+Build-Type:	Simple
+
+Source-Repository head
+  type:     git
+  location: git://github.com/msakai/haskell-optdir.git
+
+Library
+  Build-Depends:      base >=4 && <5, syb
+  Hs-Source-Dirs:     src
+  Exposed-Modules:    Data.OptDir
+  GHC-Options:        -Wall
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,3 @@
+#!/usr/bin/env runhaskell
+import Distribution.Simple
+main = defaultMain
diff --git a/src/Data/OptDir.hs b/src/Data/OptDir.hs
new file mode 100644
--- /dev/null
+++ b/src/Data/OptDir.hs
@@ -0,0 +1,32 @@
+{-# LANGUAGE DeriveDataTypeable #-}
+
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Data.OptDir
+-- Copyright   :  (c) Masahiro Sakai 2012
+-- License     :  BSD-style (see the file libraries/base/LICENSE)
+-- 
+-- Maintainer  :  masahiro.sakai@gmail.com
+-- Stability   :  stable
+-- Portability :  portable
+--
+-- The OptDir type for representing optimization directions.
+--
+-----------------------------------------------------------------------------
+
+module Data.OptDir
+  (
+    OptDir (..)
+  ) where
+
+import Data.Ix
+import Data.Typeable
+import Data.Generics
+
+{-|
+The 'OptDir' type represents optimization directions.
+-}
+data OptDir
+  = OptMin -- ^ minimization 
+  | OptMax -- ^ maximization
+  deriving (Bounded, Enum, Eq, Data, Ord, Read, Show, Ix, Typeable)