diff --git a/development/boost/iterator_categories.hpp b/development/boost/iterator_categories.hpp
new file mode 100644
index 0000000..138a5be
--- /dev/null
+++ b/development/boost/iterator_categories.hpp
@@ -0,0 +1,159 @@
+#ifndef BOOST_ITERATOR_CATEGORIES_HPP
+#define BOOST_ITERATOR_CATEGORIES_HPP
+
+#include <boost/config.hpp>
+#include <boost/type_traits/conversion_traits.hpp>
+#include <boost/type_traits/cv_traits.hpp>
+#include <boost/pending/ct_if.hpp>
+#include <boost/detail/iterator.hpp>
+
+namespace boost {
+
+  // Return Type Categories
+  struct readable_iterator_tag { };
+  struct writable_iterator_tag { };
+  struct swappable_iterator_tag { };
+  struct mutable_lvalue_iterator_tag : 
+    virtual public writable_iterator_tag,
+    virtual public readable_iterator_tag { };
+  struct constant_lvalue_iterator_tag : 
+    virtual public readable_iterator_tag { };
+
+  // Traversal Categories
+  struct forward_traversal_tag { };
+  struct bidirectional_traversal_tag : public forward_traversal_tag { };
+  struct random_access_traversal_tag : public bidirectional_traversal_tag { };
+
+  struct error_iterator_tag { };
+
+  // Inherit from iterator_base if your iterator defines its own
+  // return_category and traversal_category. Otherwise, the "old style"
+  // iterator category will be mapped to the return_category and
+  // traversal_category.
+  struct new_iterator_base { };
+
+  namespace detail {
+
+    struct return_category_from_nested_type {
+      template <typename Iterator> struct bind {
+        typedef typename Iterator::return_category type;
+      };
+    };
+
+    struct traversal_category_from_nested_type {
+      template <typename Iterator> struct bind {
+        typedef typename Iterator::traversal_category type;
+      };
+    };
+
+    template <typename ValueType>
+    struct choose_lvalue_return {
+      typedef typename ct_if<is_const<ValueType>::value,
+                             boost::constant_lvalue_iterator_tag,
+                             boost::mutable_lvalue_iterator_tag>::type type;
+    };
+    
+    
+    template <typename Category, typename ValueType>
+    struct iter_category_to_return {
+      typedef typename ct_if<
+        is_convertible<Category*, std::forward_iterator_tag*>::value,
+        typename choose_lvalue_return<ValueType>::type,
+        typename ct_if<
+          is_convertible<Category*, std::input_iterator_tag*>::value,
+          boost::readable_iterator_tag,
+          typename ct_if<
+            is_convertible<Category*, std::output_iterator_tag*>::value,
+            boost::writable_iterator_tag,
+            boost::error_iterator_tag
+          >::type
+       >::type
+      >::type type;
+    };
+
+    template <typename Category>
+    struct iter_category_to_traversal {
+      typedef typename ct_if<
+        is_convertible<Category*, std::random_access_iterator_tag*>::value,
+        random_access_traversal_tag,
+        typename ct_if<
+          is_convertible<Category*, std::bidirectional_iterator_tag*>::value,
+          bidirectional_traversal_tag,
+          forward_traversal_tag
+          >::type
+        >::type type;
+    };
+
+    struct return_category_from_old_traits {
+      template <typename Iterator> class bind {
+        typedef boost::detail::iterator_traits<Iterator> OldTraits;
+        typedef typename OldTraits::iterator_category Cat;
+        typedef typename OldTraits::value_type value_type;
+      public:
+        typedef iter_category_to_return<Cat, value_type>::type type;
+      };      
+    };
+
+    struct traversal_category_from_old_traits {
+      template <typename Iterator> class bind {
+        typedef boost::detail::iterator_traits<Iterator> OldTraits;
+        typedef typename OldTraits::iterator_category Cat;
+      public:
+        typedef iter_category_to_traversal<Cat>::type type;
+      };      
+    };
+
+    template <typename Iterator>
+    class choose_return_category {
+      typedef typename ct_if<is_convertible<Iterator*,
+                                            new_iterator_base*>::value,
+                             return_category_from_nested_type,
+                             return_category_from_old_traits>::type Choice;
+    public:
+      typedef typename Choice:: template bind<Iterator>::type type;
+    };
+
+    template <typename Iterator>
+    class choose_traversal_category {
+      typedef typename ct_if<is_convertible<Iterator*,
+                                            new_iterator_base*>::value,
+                             traversal_category_from_nested_type,
+                             traversal_category_from_old_traits>::type Choice;
+    public:
+      typedef typename Choice:: template bind<Iterator>::type type;
+    };
+    
+  } // namespace detail
+  
+  template <class Iterator>
+  struct return_category {
+    typedef typename detail::choose_return_category<Iterator>::type type;
+  };
+
+
+  template <class Iterator>
+  struct traversal_category {
+    typedef typename detail::choose_traversal_category<Iterator>::type type;
+  };
+
+#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
+
+  template <typename T>
+  struct return_category<T*>
+  {
+    typedef typename ct_if<is_const<T>::value,
+      constant_lvalue_iterator_tag,
+      mutable_lvalue_iterator_tag>::type type;
+  };
+
+  template <typename T>
+  struct traversal_category<T*>
+  {
+    typedef random_access_traversal_tag type;
+  };
+
+#endif
+
+} // namespace boost
+
+#endif // BOOST_ITERATOR_CATEGORIES_HPP
diff --git a/development/boost/iterator_concepts.hpp b/development/boost/iterator_concepts.hpp
index a3ddc8b..a30ff17 100644
--- a/development/boost/iterator_concepts.hpp
+++ b/development/boost/iterator_concepts.hpp
@@ -2,7 +2,7 @@
 #define BOOST_ITERATOR_CONCEPTS_HPP
 
 #include <boost/concept_check.hpp>
-#include <boost/iterator_traits.hpp>
+#include <boost/iterator_categories.hpp>
 #include <boost/type_traits/conversion_traits.hpp>
 #include <boost/static_assert.hpp>
 
@@ -18,10 +18,9 @@ namespace boost_concepts {
   template <typename Iterator>
   class ReadableIteratorConcept {
   public:
-    typedef typename boost::iterator_traits<Iterator>::value_type value_type;
-    typedef typename boost::iterator_traits<Iterator>::reference reference;
-    typedef typename boost::iterator_traits<Iterator>::return_category 
-      return_category;
+    typedef typename std::iterator_traits<Iterator>::value_type value_type;
+    typedef typename std::iterator_traits<Iterator>::reference reference;
+    typedef typename boost::return_category<Iterator>::type return_category;
 
     void constraints() {
       boost::function_requires< boost::SGIAssignableConcept<Iterator> >();
@@ -42,8 +41,7 @@ namespace boost_concepts {
   template <typename Iterator, typename ValueType>
   class WritableIteratorConcept {
   public:
-    typedef typename boost::iterator_traits<Iterator>::return_category 
-      return_category;
+    typedef typename boost::return_category<Iterator>::type return_category;
 
     void constraints() {
       boost::function_requires< boost::SGIAssignableConcept<Iterator> >();
@@ -54,7 +52,7 @@ namespace boost_concepts {
       BOOST_STATIC_ASSERT((boost::is_convertible<return_category*,
                            boost::writable_iterator_tag*>::value));
 
-      *i = v; // an alternative could be something like write(x, v)
+      *i = v; // a good alternative could be something like write(x, v)
     }
     ValueType v;
     Iterator i;
@@ -63,10 +61,9 @@ namespace boost_concepts {
   template <typename Iterator>
   class ConstantLvalueIteratorConcept {
   public:
-    typedef typename boost::iterator_traits<Iterator>::value_type value_type;
-    typedef typename boost::iterator_traits<Iterator>::reference reference;
-    typedef typename boost::iterator_traits<Iterator>::return_category 
-      return_category;
+    typedef typename std::iterator_traits<Iterator>::value_type value_type;
+    typedef typename std::iterator_traits<Iterator>::reference reference;
+    typedef typename boost::return_category<Iterator>::type return_category;
 
     void constraints() {
       boost::function_requires< ReadableIteratorConcept<Iterator> >();
@@ -86,10 +83,9 @@ namespace boost_concepts {
   template <typename Iterator>
   class MutableLvalueIteratorConcept {
   public:
-    typedef typename boost::iterator_traits<Iterator>::value_type value_type;
-    typedef typename boost::iterator_traits<Iterator>::reference reference;
-    typedef typename boost::iterator_traits<Iterator>::return_category 
-      return_category;
+    typedef typename std::iterator_traits<Iterator>::value_type value_type;
+    typedef typename std::iterator_traits<Iterator>::reference reference;
+    typedef typename boost::return_category<Iterator>::type return_category;
 
     void constraints() {
       boost::function_requires< ReadableIteratorConcept<Iterator> >();
@@ -111,12 +107,9 @@ namespace boost_concepts {
   // Iterator Traversal Concepts
 
   template <typename Iterator>
-  class SinglePassIteratorConcept {
+  class ForwardIteratorConcept {
   public:
-    typedef typename boost::iterator_traits<Iterator>::traversal_category 
-      traversal_category;
-    typedef typename boost::iterator_traits<Iterator>::difference_type
-      difference_type;
+    typedef typename boost::traversal_category<Iterator>::type traversal_category;
 
     void constraints() {
       boost::function_requires< boost::SGIAssignableConcept<Iterator> >();
@@ -125,42 +118,23 @@ namespace boost_concepts {
         boost::DefaultConstructibleConcept<Iterator> >();
 
       BOOST_STATIC_ASSERT((boost::is_convertible<traversal_category*, 
-                           boost::single_pass_iterator_tag*>::value));
-
-      // difference_type must be a signed integral type
-
+                           boost::forward_traversal_tag*>::value));
       ++i;
       (void)i++;
     }
-    
     Iterator i;
   };
   
-  template <typename Iterator>
-  class ForwardIteratorConcept {
-  public:
-    typedef typename boost::iterator_traits<Iterator>::traversal_category 
-      traversal_category;
-
-    void constraints() {
-      boost::function_requires< SinglePassIteratorConcept<Iterator> >();
-
-      BOOST_STATIC_ASSERT((boost::is_convertible<traversal_category*, 
-                           boost::forward_iterator_tag*>::value));
-    }
-  };
-  
   template <typename Iterator>
   class BidirectionalIteratorConcept {
   public:
-    typedef typename boost::iterator_traits<Iterator>::traversal_category 
-      traversal_category;
+    typedef typename boost::traversal_category<Iterator>::type traversal_category;
 
     void constraints() {
       boost::function_requires< ForwardIteratorConcept<Iterator> >();
       
       BOOST_STATIC_ASSERT((boost::is_convertible<traversal_category*, 
-                           boost::bidirectional_iterator_tag*>::value));
+                           boost::bidirectional_traversal_tag*>::value));
 
       --i;
       (void)i--;
@@ -171,16 +145,15 @@ namespace boost_concepts {
   template <typename Iterator>
   class RandomAccessIteratorConcept {
   public:
-    typedef typename boost::iterator_traits<Iterator>::traversal_category 
-      traversal_category;
-    typedef typename boost::iterator_traits<Iterator>::difference_type
+    typedef typename boost::traversal_category<Iterator>::type traversal_category;
+    typedef typename std::iterator_traits<Iterator>::difference_type
       difference_type;
 
     void constraints() {
       boost::function_requires< BidirectionalIteratorConcept<Iterator> >();
 
       BOOST_STATIC_ASSERT((boost::is_convertible<traversal_category*, 
-                           boost::random_access_iterator_tag*>::value));
+                           boost::random_access_traversal_tag*>::value));
       
       i += n;
       i = i + n;
diff --git a/development/boost/iterator_traits.hpp b/development/boost/iterator_traits.hpp
deleted file mode 100644
index 6f5d9b2..0000000
--- a/development/boost/iterator_traits.hpp
+++ /dev/null
@@ -1,137 +0,0 @@
-#ifndef BOOST_ITERATOR_TRAITS_HPP
-#define BOOST_ITERATOR_TRAITS_HPP
-
-#include <boost/config.hpp>
-#include <boost/type_traits/conversion_traits.hpp>
-#include <boost/type_traits/cv_traits.hpp>
-#include <boost/pending/ct_if.hpp>
-#include <boost/detail/iterator.hpp>
-
-namespace boost {
-
-  // Traversal Categories
-  struct single_pass_iterator_tag { };
-  struct forward_iterator_tag : public single_pass_iterator_tag { };
-  struct bidirectional_iterator_tag : public forward_iterator_tag { };
-  struct random_access_iterator_tag : public bidirectional_iterator_tag { };
-  
-  // Return Type Categories
-  struct readable_iterator_tag { };
-  struct writable_iterator_tag { };
-  struct mutable_lvalue_iterator_tag : virtual public writable_iterator_tag,
-    virtual public readable_iterator_tag { };
-  struct constant_lvalue_iterator_tag : public readable_iterator_tag { };
-
-  struct error_iterator_tag { };
-
-  // Inherit from iterator_base if your iterator defines its own
-  // return_category and traversal_category. Otherwise, the "old style"
-  // iterator category will be mapped to the return_category and
-  // traversal_category.
-  struct new_iterator_base { };
-
-  namespace detail {
-
-    struct iter_traits_from_nested_types {
-      template <typename Iterator> struct bind {
-        typedef typename Iterator::value_type value_type;
-        typedef typename Iterator::reference reference;
-        typedef typename Iterator::pointer pointer;
-        typedef typename Iterator::difference_type difference_type;
-        typedef typename Iterator::return_category return_category;
-        typedef typename Iterator::traversal_category traversal_category;
-      };
-    };
-
-    template <typename ValueType>
-    struct choose_lvalue_return {
-      typedef typename ct_if<is_const<ValueType>::value,
-			     boost::constant_lvalue_iterator_tag,
-			     boost::mutable_lvalue_iterator_tag>::type type;
-    };
-    
-    
-    template <typename Category, typename ValueType>
-    struct iter_category_to_return {
-      typedef typename ct_if<
-        is_convertible<Category*, std::forward_iterator_tag*>::value,
-        typename choose_lvalue_return<ValueType>::type,
-        typename ct_if<
-          is_convertible<Category*, std::input_iterator_tag*>::value,
-          boost::readable_iterator_tag,
-          typename ct_if<
-            is_convertible<Category*, std::output_iterator_tag*>::value,
-            boost::writable_iterator_tag,
-            boost::error_iterator_tag
-          >::type
-       >::type
-      >::type type;
-    };
-
-    template <typename Category>
-    struct iter_category_to_traversal {
-      typedef typename ct_if<
-        is_convertible<Category*, std::random_access_iterator_tag*>::value,
-        boost::random_access_iterator_tag,
-        typename ct_if<
-          is_convertible<Category*, std::bidirectional_iterator_tag*>::value,
-          boost::bidirectional_iterator_tag,
-          typename ct_if<
-            is_convertible<Category*, std::forward_iterator_tag*>::value,
-            boost::forward_iterator_tag,
-            boost::single_pass_iterator_tag>::type
-          >::type
-        >::type type;
-    };
-
-    struct iter_traits_from_old_traits {
-      template <typename Iterator> class bind {
-        typedef boost::detail::iterator_traits<Iterator> OldTraits;
-        typedef typename OldTraits::iterator_category Cat;
-      public:
-        typedef typename OldTraits::value_type value_type;
-        typedef typename OldTraits::reference reference;
-        typedef typename OldTraits::pointer pointer;
-        typedef typename OldTraits::difference_type difference_type;
-        typedef iter_category_to_return<Cat,value_type>::type return_category;
-        typedef iter_category_to_traversal<Cat>::type traversal_category;
-      };      
-    };
-
-    template <typename Iterator>
-    class choose_iter_traits {
-      typedef typename ct_if<is_convertible<Iterator*,
-                                            new_iterator_base*>::value,
-                             iter_traits_from_nested_types,
-                             iter_traits_from_old_traits>::type Choice;
-    public:
-      typedef typename Choice:: template bind<Iterator> type;
-    };
-    
-  } // namespace detail
-  
-  template <typename Iterator>
-  class iterator_traits
-    : public detail::choose_iter_traits<Iterator>::type { };
-
-#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
-
-  template <typename T>
-  struct iterator_traits<T*>
-  {
-    typedef T value_type;
-    typedef T& reference;
-    typedef T* pointer;
-    typedef std::ptrdiff_t difference_type;
-    typedef typename ct_if<is_const<T>::value,
-			   boost::constant_lvalue_iterator_tag,
-			   boost::mutable_lvalue_iterator_tag>::type
-      return_category;
-    typedef boost::random_access_iterator_tag traversal_category;
-  };
-
-#endif
-
-} // namespace boost
-
-#endif // BOOST_ITERATOR_TRAITS_HPP