diff --git a/include/boost/geometry/extensions/nsphere/algorithms/disjoint.hpp b/include/boost/geometry/extensions/nsphere/algorithms/disjoint.hpp
index 31cc8d6ea..4e73ba8e7 100644
--- a/include/boost/geometry/extensions/nsphere/algorithms/disjoint.hpp
+++ b/include/boost/geometry/extensions/nsphere/algorithms/disjoint.hpp
@@ -132,7 +132,7 @@ struct disjoint<Point, NSphere, DimensionCount, point_tag, nsphere_tag, Reverse>
     static inline bool apply(Point const& p, NSphere const& s)
     {
         typedef typename coordinate_system<Point>::type p_cs;
-        typedef typename typename coordinate_system<NSphere>::type s_cs;
+        typedef typename coordinate_system<NSphere>::type s_cs;
         static const bool check_cs = ::boost::is_same<p_cs, cs::cartesian>::value && ::boost::is_same<s_cs, cs::cartesian>::value;
         BOOST_MPL_ASSERT_MSG(check_cs, NOT_IMPLEMENTED_FOR_THOSE_COORDINATE_SYSTEMS, (p_cs, s_cs));
 
@@ -149,7 +149,7 @@ struct disjoint<NSphere, Box, DimensionCount, nsphere_tag, box_tag, Reverse>
     static inline bool apply(NSphere const& s, Box const& b)
     {
         typedef typename coordinate_system<Box>::type b_cs;
-        typedef typename typename coordinate_system<NSphere>::type s_cs;
+        typedef typename coordinate_system<NSphere>::type s_cs;
         static const bool check_cs = ::boost::is_same<b_cs, cs::cartesian>::value && ::boost::is_same<s_cs, cs::cartesian>::value;
         BOOST_MPL_ASSERT_MSG(check_cs, NOT_IMPLEMENTED_FOR_THOSE_COORDINATE_SYSTEMS, (b_cs, s_cs));
 
@@ -165,15 +165,20 @@ struct disjoint<NSphere1, NSphere2, DimensionCount, nsphere_tag, nsphere_tag, Re
 {
     static inline bool apply(NSphere1 const& s1, NSphere2 const& s2)
     {
-        typedef typename typename coordinate_system<NSphere1>::type s1_cs;
-        typedef typename typename coordinate_system<NSphere2>::type s2_cs;
+        typedef typename coordinate_system<NSphere1>::type s1_cs;
+        typedef typename coordinate_system<NSphere2>::type s2_cs;
         static const bool check_cs = ::boost::is_same<s1_cs, cs::cartesian>::value && ::boost::is_same<s2_cs, cs::cartesian>::value;
         BOOST_MPL_ASSERT_MSG(check_cs, NOT_IMPLEMENTED_FOR_THOSE_COORDINATE_SYSTEMS, (s1_cs, s2_cs));
 
-        return get_radius<0>(s1) + get_radius<0>(s2)
+        /*return get_radius<0>(s1) + get_radius<0>(s2)
                <   ::sqrt(geometry::detail::disjoint::points_or_spheres_comparable_distance_cartesian<
-                              Point, NSphere, 0, DimensionCount
-                          >::apply(p, s));
+                              NSphere1, NSphere2, 0, DimensionCount
+                          >::apply(s1, s2));*/
+
+        return get_radius<0>(s1) * get_radius<0>(s1) + 2 * get_radius<0>(s1) * get_radius<0>(s2) + get_radius<0>(s2) * get_radius<0>(s2)
+               <   geometry::detail::disjoint::points_or_spheres_comparable_distance_cartesian<
+                       NSphere1, NSphere2, 0, DimensionCount
+                   >::apply(s1, s2);
     }
 };
 
diff --git a/include/boost/geometry/extensions/nsphere/index/detail/algorithms/content.hpp b/include/boost/geometry/extensions/nsphere/index/detail/algorithms/content.hpp
new file mode 100644
index 000000000..d1fc044b1
--- /dev/null
+++ b/include/boost/geometry/extensions/nsphere/index/detail/algorithms/content.hpp
@@ -0,0 +1,76 @@
+// Boost.Geometry Index
+//
+// n-dimensional content (hypervolume) - 2d area, 3d volume, ...
+//
+// Copyright (c) 2011-2013 Adam Wulkiewicz, Lodz, Poland.
+//
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_GEOMETRY_EXTENSIONS_NSPHERE_INDEX_DETAIL_ALGORITHMS_CONTENT_HPP
+#define BOOST_GEOMETRY_EXTENSIONS_NSPHERE_INDEX_DETAIL_ALGORITHMS_CONTENT_HPP
+
+#include <boost/geometry/index/detail/algorithms/content.hpp>
+
+namespace boost { namespace geometry { namespace index { namespace detail {
+
+namespace dispatch {
+
+// TODO replace it by comparable_content?
+// probably radius^Dimension would be sufficient
+// WARNING! this would work only if the same Geometries were compared
+// so it shouldn't be used in the case of Variants!
+// The same with margin()!
+
+template <typename NSphere, size_t Dimension>
+struct content_nsphere
+{
+    BOOST_STATIC_ASSERT(2 < Dimension);
+
+    typedef typename detail::default_content_result<NSphere>::type result_type;
+    
+    static inline result_type apply(NSphere const& s)
+    {
+        return (content_nsphere<NSphere, Dimension - 2>::apply(s)
+                    * 2 * get_radius<0>(s) * get_radius<0>(s)
+                    * ::boost::math::constants::pi<result_type>()) / Dimension;
+    }
+};
+
+template <typename NSphere>
+struct content_nsphere<NSphere, 2>
+{
+    typedef typename detail::default_content_result<NSphere>::type result_type;
+
+    static inline result_type apply(NSphere const& s)
+    {
+        return ::boost::math::constants::pi<result_type>() * get_radius<0>(s) * get_radius<0>(s);
+    }
+};
+
+template <typename NSphere>
+struct content_nsphere<NSphere, 1>
+{
+    typedef typename detail::default_content_result<NSphere>::type result_type;
+
+    static inline result_type apply(NSphere const& s)
+    {
+        return 2 * get_radius<0>(s);
+    }
+};
+
+template <typename Indexable>
+struct content<Indexable, nsphere_tag>
+{
+    static typename default_content_result<Indexable>::type apply(Indexable const& i)
+    {
+        return dispatch::content_nsphere<Indexable, detail::traits::dimension<Indexable>::value>::apply(i);
+    }
+};
+
+} // namespace dispatch
+
+}}}} // namespace boost::geometry::index::detail
+
+#endif // BOOST_GEOMETRY_EXTENSIONS_NSPHERE_INDEX_DETAIL_ALGORITHMS_CONTENT_HPP
diff --git a/include/boost/geometry/extensions/nsphere/index/detail/algorithms/is_valid.hpp b/include/boost/geometry/extensions/nsphere/index/detail/algorithms/is_valid.hpp
new file mode 100644
index 000000000..fec746168
--- /dev/null
+++ b/include/boost/geometry/extensions/nsphere/index/detail/algorithms/is_valid.hpp
@@ -0,0 +1,33 @@
+// Boost.Geometry Index
+//
+// n-dimensional Indexable validity check
+//
+// Copyright (c) 2011-2013 Adam Wulkiewicz, Lodz, Poland.
+//
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_GEOMETRY_EXTENSIONS_INDEX_DETAIL_ALGORITHMS_IS_VALID_HPP
+#define BOOST_GEOMETRY_EXTENSIONS_INDEX_DETAIL_ALGORITHMS_IS_VALID_HPP
+
+#include <boost/geometry/index/detail/algorithms/is_valid.hpp>
+
+namespace boost { namespace geometry { namespace index { namespace detail {
+
+namespace dispatch {
+
+template <typename Indexable>
+struct is_valid<Indexable, nsphere_tag>
+{
+    static inline bool apply(Indexable const& i)
+    {
+        return 0 <= geometry::get_radius<0>(i);
+    }
+};
+
+} // namespace dispatch
+
+}}}} // namespace boost::geometry::index::detail
+
+#endif // BOOST_GEOMETRY_EXTENSIONS_INDEX_DETAIL_ALGORITHMS_IS_VALID_HPP
diff --git a/include/boost/geometry/extensions/nsphere/index/detail/algorithms/margin.hpp b/include/boost/geometry/extensions/nsphere/index/detail/algorithms/margin.hpp
new file mode 100644
index 000000000..472c31776
--- /dev/null
+++ b/include/boost/geometry/extensions/nsphere/index/detail/algorithms/margin.hpp
@@ -0,0 +1,59 @@
+// Boost.Geometry Index
+//
+// n-dimensional margin value (hypersurface), 2d perimeter, 3d surface, etc...
+//
+// Copyright (c) 2011-2013 Adam Wulkiewicz, Lodz, Poland.
+//
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_GEOMETRY_EXTENSIONS_NSPHERE_INDEX_DETAIL_ALGORITHMS_MARGIN_HPP
+#define BOOST_GEOMETRY_EXTENSIONS_NSPHERE_INDEX_DETAIL_ALGORITHMS_MARGIN_HPP
+
+#include <boost/geometry/index/detail/algorithms/margin.hpp>
+
+namespace boost { namespace geometry { namespace index { namespace detail {
+
+template <typename NSphere, size_t Dimension>
+struct comparable_margin_nsphere
+{
+    BOOST_STATIC_ASSERT(1 < Dimension);
+    BOOST_STATIC_ASSERT(Dimension <= detail::traits::dimension<NSphere>::value);
+
+    static inline typename default_margin_result<NSphere>::type apply(NSphere const& s)
+    {
+        return comparable_margin_nsphere<NSphere, Dimension-1>::apply(s)
+            * geometry::get_radius<0>(s);
+    }
+};
+
+template <typename NSphere>
+struct comparable_margin_nsphere<NSphere, 1>
+{
+    static inline typename default_margin_result<NSphere>::type apply(NSphere const& s)
+    {
+        return 1;
+    }
+};
+
+namespace dispatch {
+
+template <typename NSphere>
+struct comparable_margin<NSphere, nsphere_tag>
+{
+    typedef typename default_margin_result<NSphere>::type result_type;
+
+    static inline result_type apply(NSphere const& g)
+    {
+        return comparable_margin_nsphere<
+            NSphere, dimension<NSphere>::value
+        >::apply(g);
+    }
+};
+
+} // namespace dispatch
+
+}}}} // namespace boost::geometry::index::detail
+
+#endif // BOOST_GEOMETRY_EXTENSIONS_NSPHERE_INDEX_DETAIL_ALGORITHMS_MARGIN_HPP
diff --git a/include/boost/geometry/extensions/nsphere/index/detail/indexable.hpp b/include/boost/geometry/extensions/nsphere/index/detail/indexable.hpp
new file mode 100644
index 000000000..c82d5e9b4
--- /dev/null
+++ b/include/boost/geometry/extensions/nsphere/index/detail/indexable.hpp
@@ -0,0 +1,30 @@
+// Boost.Geometry Index
+//
+// Indexable's traits and related functions
+//
+// Copyright (c) 2011-2013 Adam Wulkiewicz, Lodz, Poland.
+//
+// Use, modification and distribution is subject to the Boost Software License,
+// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/geometry/index/detail/indexable.hpp>
+
+#ifndef BOOST_GEOMETRY_EXTENSIONS_NSPHERE_INDEX_DETAIL_INDEXABLE_HPP
+#define BOOST_GEOMETRY_EXTENSIONS_NSPHERE_INDEX_DETAIL_INDEXABLE_HPP
+
+namespace boost { namespace geometry { namespace index { namespace detail {
+
+namespace dispatch {
+
+template <typename Indexable>
+struct point_type<Indexable, geometry::nsphere_tag>
+{
+    typedef typename geometry::traits::point_type<Indexable>::type type;
+};
+
+} // namespace dispatch
+
+}}}} // namespace boost::geometry::index::detail
+
+#endif // BOOST_GEOMETRY_EXTENSIONS_NSPHERE_INDEX_DETAIL_INDEXABLE_HPP
diff --git a/include/boost/geometry/extensions/nsphere/nsphere.hpp b/include/boost/geometry/extensions/nsphere/nsphere.hpp
index 0f5ea1ea6..2fea4360c 100644
--- a/include/boost/geometry/extensions/nsphere/nsphere.hpp
+++ b/include/boost/geometry/extensions/nsphere/nsphere.hpp
@@ -35,4 +35,9 @@
 #include <boost/geometry/extensions/nsphere/algorithms/within.hpp>
 #include <boost/geometry/extensions/nsphere/algorithms/disjoint.hpp>
 
+#include <boost/geometry/extensions/nsphere/index/detail/indexable.hpp>
+#include <boost/geometry/extensions/nsphere/index/detail/algorithms/content.hpp>
+#include <boost/geometry/extensions/nsphere/index/detail/algorithms/is_valid.hpp>
+#include <boost/geometry/extensions/nsphere/index/detail/algorithms/margin.hpp>
+
 #endif // BOOST_GEOMETRY_EXTENSIONS_NSPHERE_HPP
diff --git a/include/boost/geometry/index/detail/algorithms/content.hpp b/include/boost/geometry/index/detail/algorithms/content.hpp
index 5425d9db7..1b6e370a1 100644
--- a/include/boost/geometry/index/detail/algorithms/content.hpp
+++ b/include/boost/geometry/index/detail/algorithms/content.hpp
@@ -1,6 +1,6 @@
 // Boost.Geometry Index
 //
-// n-dimensional box's content (hypervolume) - 2d area, 3d volume, ...
+// n-dimensional content (hypervolume) - 2d area, 3d volume, ...
 //
 // Copyright (c) 2011-2013 Adam Wulkiewicz, Lodz, Poland.
 //
@@ -19,7 +19,7 @@ template <typename Indexable>
 struct default_content_result
 {
     typedef typename select_most_precise<
-        typename detail::traits::coordinate_type<Indexable>::type,
+        typename coordinate_type<Indexable>::type,
         long double
     >::type type;
 };
@@ -27,20 +27,20 @@ struct default_content_result
 namespace dispatch {
 
 template <typename Box, size_t CurrentDimension>
-struct content_for_each_dimension
+struct content_box
 {
     BOOST_STATIC_ASSERT(0 < CurrentDimension);
-    BOOST_STATIC_ASSERT(CurrentDimension <= traits::dimension<Box>::value);
+    //BOOST_STATIC_ASSERT(CurrentDimension <= traits::dimension<Box>::value);
 
     static inline typename detail::default_content_result<Box>::type apply(Box const& b)
     {
-        return content_for_each_dimension<Box, CurrentDimension - 1>::apply(b) *
+        return content_box<Box, CurrentDimension - 1>::apply(b) *
             ( detail::get<max_corner, CurrentDimension - 1>(b) - detail::get<min_corner, CurrentDimension - 1>(b) );
     }
 };
 
 template <typename Box>
-struct content_for_each_dimension<Box, 1>
+struct content_box<Box, 1>
 {
     static inline typename detail::default_content_result<Box>::type apply(Box const& b)
     {
@@ -51,7 +51,7 @@ struct content_for_each_dimension<Box, 1>
 template <typename Indexable, typename Tag>
 struct content
 {
-    // TODO: awulkiew - static assert?
+    BOOST_MPL_ASSERT_MSG(false, NOT_IMPLEMENTED_FOR_THIS_INDEXABLE_AND_TAG, (Indexable, Tag));
 };
 
 template <typename Indexable>
@@ -68,7 +68,7 @@ struct content<Indexable, box_tag>
 {
     static typename default_content_result<Indexable>::type apply(Indexable const& b)
     {
-        return dispatch::content_for_each_dimension<Indexable, detail::traits::dimension<Indexable>::value>::apply(b);
+        return dispatch::content_box<Indexable, dimension<Indexable>::value>::apply(b);
     }
 };
 
@@ -78,7 +78,7 @@ template <typename Indexable>
 typename default_content_result<Indexable>::type content(Indexable const& b)
 {
     return dispatch::content<Indexable,
-                             typename detail::traits::tag<Indexable>::type
+                             typename tag<Indexable>::type
                             >::apply(b);
 }
 
diff --git a/include/boost/geometry/index/detail/algorithms/margin.hpp b/include/boost/geometry/index/detail/algorithms/margin.hpp
index 03e981190..7389ec72d 100644
--- a/include/boost/geometry/index/detail/algorithms/margin.hpp
+++ b/include/boost/geometry/index/detail/algorithms/margin.hpp
@@ -13,6 +13,9 @@
 
 #include <boost/geometry/index/detail/indexable.hpp>
 
+// WARNING! comparable_margin() will work only if the same Geometries are compared
+// so it shouldn't be used in the case of Variants!
+
 namespace boost { namespace geometry { namespace index { namespace detail {
 
 template <typename Box>
@@ -90,11 +93,15 @@ struct default_margin_result
 //    }
 //};
 
+// TODO - test if this definition of margin is ok for Dimension > 2
+// Now it's sum of edges lengths
+// maybe margin_for_each_dimension should be used to get more or less hypersurface?
+
 template <typename Box, size_t CurrentDimension>
 struct simple_margin_for_each_dimension
 {
     BOOST_STATIC_ASSERT(0 < CurrentDimension);
-    BOOST_STATIC_ASSERT(CurrentDimension <= detail::traits::dimension<Box>::value);
+    //BOOST_STATIC_ASSERT(CurrentDimension <= dimension<Box>::value);
 
     static inline typename default_margin_result<Box>::type apply(Box const& b)
     {
@@ -112,17 +119,49 @@ struct simple_margin_for_each_dimension<Box, 1>
     }
 };
 
-template <typename Box>
-typename default_margin_result<Box>::type comparable_margin(Box const& b)
+namespace dispatch {
+
+template <typename Geometry, typename Tag>
+struct comparable_margin
 {
-    //return detail::margin_for_each_dimension<Box, detail::traits::dimension<Box>::value>::apply(b);
-    return detail::simple_margin_for_each_dimension<Box, detail::traits::dimension<Box>::value>::apply(b);
+    BOOST_MPL_ASSERT_MSG(false, NOT_IMPLEMENTED_FOR_THIS_GEOMETRY, (Geometry, Tag));
+};
+
+template <typename Geometry>
+struct comparable_margin<Geometry, point_tag>
+{
+    typedef typename default_margin_result<Geometry>::type result_type;
+
+    static inline result_type apply(Geometry const& g) { return 0; }
+};
+
+template <typename Box>
+struct comparable_margin<Box, box_tag>
+{
+    typedef typename default_margin_result<Box>::type result_type;
+
+    static inline result_type apply(Box const& g)
+    {
+        //return detail::margin_for_each_dimension<Box, dimension<Box>::value>::apply(g);
+        return detail::simple_margin_for_each_dimension<Box, dimension<Box>::value>::apply(g);
+    }
+};
+
+} // namespace dispatch
+
+template <typename Geometry>
+typename default_margin_result<Geometry>::type comparable_margin(Geometry const& g)
+{
+    return dispatch::comparable_margin<
+        Geometry,
+        typename tag<Geometry>::type
+    >::apply(g);
 }
 
 //template <typename Box>
 //typename default_margin_result<Box>::type margin(Box const& b)
 //{
-//    return 2 * detail::margin_for_each_dimension<Box, detail::traits::dimension<Box>::value>::apply(b);
+//    return 2 * detail::margin_for_each_dimension<Box, dimension<Box>::value>::apply(b);
 //}
 
 }}}} // namespace boost::geometry::index::detail