diff --git a/include/boost/multi_array.hpp b/include/boost/multi_array.hpp
index 13ab1d5..03a601e 100644
--- a/include/boost/multi_array.hpp
+++ b/include/boost/multi_array.hpp
@@ -163,7 +163,7 @@ public:
     allocate_space();
     std::copy(rhs.begin(),rhs.end(),this->begin());
   }
-
+    
   // Since assignment is a deep copy, multi_array_ref
   // contains all the necessary code.
   template <typename ConstMultiArray>
diff --git a/include/boost/multi_array/base.hpp b/include/boost/multi_array/base.hpp
index d3081d4..905e4a5 100644
--- a/include/boost/multi_array/base.hpp
+++ b/include/boost/multi_array/base.hpp
@@ -78,8 +78,7 @@ class sub_array;
 template <typename T, std::size_t NumDims, typename TPtr = const T*>
 class const_sub_array;
 
-template <typename T, typename TPtr, std::size_t NumDims,
-          typename AccessCategory, typename Reference>
+template <typename T, typename TPtr, std::size_t NumDims, typename Reference>
 class array_iterator;
 
 template <typename T, std::size_t NumDims, typename TPtr = const T*>
@@ -244,20 +243,8 @@ public:
   //
   // iterator support
   //
-
-  typedef typename
-  mpl::if_c<(NumDims == 1), 
-    writable_lvalue_iterator_tag,
-    readable_writable_iterator_tag>::type  iterator_tag;
-
-  typedef typename 
-  mpl::if_c<(NumDims == 1),
-    readable_lvalue_iterator_tag,
-    readable_iterator_tag>::type const_iterator_tag;
-
-  typedef array_iterator<T,T*,NumDims,iterator_tag,reference> iterator;
-  typedef array_iterator<T,
-    T const*,NumDims,const_iterator_tag,const_reference> const_iterator;
+  typedef array_iterator<T,T*,NumDims,reference> iterator;
+  typedef array_iterator<T,T const*,NumDims,const_reference> const_iterator;
 
   typedef ::boost::reverse_iterator<iterator> reverse_iterator;
   typedef ::boost::reverse_iterator<const_iterator> const_reverse_iterator;
diff --git a/include/boost/multi_array/concept_checks.hpp b/include/boost/multi_array/concept_checks.hpp
index a866231..6586618 100644
--- a/include/boost/multi_array/concept_checks.hpp
+++ b/include/boost/multi_array/concept_checks.hpp
@@ -19,6 +19,7 @@
 //
 
 #include "boost/concept_check.hpp"
+#include "boost/iterator/iterator_concepts.hpp"
 
 namespace boost {
 namespace detail {
@@ -99,6 +100,11 @@ namespace multi_array {
     typedef typename Array::extent_gen extent_gen;
     typedef typename Array::extent_range extent_range;
 
+    BOOST_CLASS_REQUIRE(iterator, boost_concepts, ForwardTraversalConcept);
+    BOOST_CLASS_REQUIRE(iterator, boost_concepts, ReadableIteratorConcept);
+    BOOST_CLASS_REQUIRE(const_iterator, boost_concepts, ForwardTraversalConcept);
+    BOOST_CLASS_REQUIRE(const_iterator, boost_concepts, ReadableIteratorConcept);
+                  
     Array a;
     size_type st;
     const size_type* stp;
@@ -180,6 +186,12 @@ namespace multi_array {
     typedef typename Array::extent_gen extent_gen;
     typedef typename Array::extent_range extent_range;
 
+    BOOST_CLASS_REQUIRE(iterator, boost_concepts, ForwardTraversalConcept);
+    BOOST_CLASS_REQUIRE(iterator, boost_concepts, ReadableIteratorConcept);
+    BOOST_CLASS_REQUIRE(iterator, boost_concepts, WritableIteratorConcept);
+    BOOST_CLASS_REQUIRE(const_iterator, boost_concepts, ForwardTraversalConcept);
+    BOOST_CLASS_REQUIRE(const_iterator, boost_concepts, ReadableIteratorConcept);
+      
     Array a;
     size_type st;
     const size_type* stp;
diff --git a/include/boost/multi_array/iterator.hpp b/include/boost/multi_array/iterator.hpp
index 92409d3..2e933cf 100644
--- a/include/boost/multi_array/iterator.hpp
+++ b/include/boost/multi_array/iterator.hpp
@@ -43,28 +43,25 @@ struct operator_arrow_proxy
 };
 
 
-template <typename T, typename TPtr, std::size_t NumDims,
-          typename AccessCategory, typename Reference>
+template <typename T, typename TPtr, std::size_t NumDims, typename Reference>
 class array_iterator :
     public iterator_facade<
-             array_iterator<T,TPtr,NumDims,AccessCategory,Reference>,
+             array_iterator<T,TPtr,NumDims,Reference>,
              typename value_accessor_generator<T,NumDims>::type::value_type,
-             AccessCategory,
-             ::boost::random_access_traversal_tag,
+             boost::random_access_traversal_tag,
              Reference
            >,
     private value_accessor_generator<T,NumDims>::type
 {
   friend class iterator_core_access;
-  template <typename TT, typename TP, std::size_t N, typename AC, typename R>
+  template <typename TT, typename TP, std::size_t N, typename R>
     friend class array_iterator;
 
   typedef typename value_accessor_generator<T,NumDims>::type access_t;
 
   typedef  iterator_facade<
-             array_iterator<T,TPtr,NumDims,AccessCategory,Reference>,
+             array_iterator<T,TPtr,NumDims,Reference>,
              typename access_t::value_type,
-             AccessCategory,
              ::boost::random_access_traversal_tag,
              Reference
            > facade_type;
@@ -93,9 +90,11 @@ public:
     idx_(idx), base_(base), extents_(extents),
     strides_(strides), index_base_(index_base) { }
 
-  template <typename OPtr, typename Cat, typename ORef>
-  array_iterator(const
-                 array_iterator<T,OPtr,NumDims,Cat,ORef>& rhs)
+  template <typename OPtr, typename ORef>
+  array_iterator(
+      const array_iterator<T,OPtr,NumDims,ORef>& rhs
+    , typename boost::enable_if_convertible<OPtr,TPtr>::type* = 0
+  )
     : idx_(rhs.idx_), base_(rhs.base_), extents_(rhs.extents_),
     strides_(rhs.strides_), index_base_(rhs.index_base_) { }
 
diff --git a/include/boost/multi_array/multi_array_ref.hpp b/include/boost/multi_array/multi_array_ref.hpp
index 0cec5f6..d98a5c5 100644
--- a/include/boost/multi_array/multi_array_ref.hpp
+++ b/include/boost/multi_array/multi_array_ref.hpp
@@ -71,6 +71,9 @@ public:
   // make const_multi_array_ref a friend of itself
   template <typename,std::size_t,typename>
   friend class const_multi_array_ref;
+
+//  template <typename From, typename To>  // needed for enable_if_convertible tests
+//  friend class boost::detail::is_convertible_basic_impl;
 #endif
 
   template <typename OPtr>
@@ -322,9 +325,10 @@ public:
   void set_base_ptr(TPtr new_base) { base_ = new_base; }
 
   template <typename OPtr>
-  const_multi_array_ref(const detail::multi_array::
-                  const_sub_array<T,NumDims,OPtr>& rhs)
-    : base_(rhs.origin()),
+  const_multi_array_ref(
+      const detail::multi_array::const_sub_array<T,NumDims,OPtr>& rhs
+  )
+    : base_(0), // playing it "safe"; so we learn of errors
       storage_(c_storage_order()),
       origin_offset_(0), directional_offset_(0),
       num_elements_(rhs.num_elements())
@@ -395,7 +399,6 @@ private:
   }
 };
 
-
 template <typename T, std::size_t NumDims>
 class multi_array_ref :
   public const_multi_array_ref<T,NumDims,T*>
diff --git a/test/Jamfile b/test/Jamfile
index 4d69914..60193de 100755
--- a/test/Jamfile
+++ b/test/Jamfile
@@ -9,20 +9,7 @@ subproject libs/multi_array/test ;
 import testing ;
 
 test-suite multi_array
-    : [ run constructors.cpp <lib>../../test/build/boost_test_exec_monitor ]
-      [ run access.cpp <lib>../../test/build/boost_test_exec_monitor ]
-      [ run compare.cpp <lib>../../test/build/boost_test_exec_monitor ]
-      [ run iterators.cpp <lib>../../test/build/boost_test_exec_monitor ]
-      [ run slice.cpp <lib>../../test/build/boost_test_exec_monitor ]
-      [ run assign.cpp <lib>../../test/build/boost_test_exec_monitor ]
-      [ run index_bases.cpp <lib>../../test/build/boost_test_exec_monitor ]
-      [ run storage_order.cpp <lib>../../test/build/boost_test_exec_monitor ]
-      [ run reshape.cpp <lib>../../test/build/boost_test_exec_monitor ]
-      [ run range1.cpp <lib>../../test/build/boost_test_exec_monitor  ]
-      [ run idxgen1.cpp <lib>../../test/build/boost_test_exec_monitor ]
-      [ run stl_interaction.cpp <lib>../../test/build/boost_test_exec_monitor ]
-      [ run resize.cpp <lib>../../test/build/boost_test_exec_monitor ]
-      [ compile concept_checks.cpp ]
+    : 
       [ compile-fail fail_cbracket.cpp ]
       [ compile-fail fail_cdata.cpp ]
       [ compile-fail fail_citerator.cpp ]
@@ -45,4 +32,19 @@ test-suite multi_array
       [ compile-fail fail_ref_cview.cpp ]
       [ compile-fail fail_ref_cview2.cpp ]
       [ compile-fail fail_ref_cview3.cpp ]
+  
+      [ run constructors.cpp <lib>../../test/build/boost_test_exec_monitor ]
+      [ run access.cpp <lib>../../test/build/boost_test_exec_monitor ]
+      [ run compare.cpp <lib>../../test/build/boost_test_exec_monitor ]
+      [ run iterators.cpp <lib>../../test/build/boost_test_exec_monitor ]
+      [ run slice.cpp <lib>../../test/build/boost_test_exec_monitor ]
+      [ run assign.cpp <lib>../../test/build/boost_test_exec_monitor ]
+      [ run index_bases.cpp <lib>../../test/build/boost_test_exec_monitor ]
+      [ run storage_order.cpp <lib>../../test/build/boost_test_exec_monitor ]
+      [ run reshape.cpp <lib>../../test/build/boost_test_exec_monitor ]
+      [ run range1.cpp <lib>../../test/build/boost_test_exec_monitor  ]
+      [ run idxgen1.cpp <lib>../../test/build/boost_test_exec_monitor ]
+      [ run stl_interaction.cpp <lib>../../test/build/boost_test_exec_monitor ]
+      [ run resize.cpp <lib>../../test/build/boost_test_exec_monitor ]
+      [ compile concept_checks.cpp ]
     ;