diff --git a/src/block.cc b/src/block.cc
new file mode 100644
index 0000000..a06bbd0
--- /dev/null
+++ b/src/block.cc
@@ -0,0 +1,127 @@
+// -*- C++ -*-
+
+#include "block.h"
+
+namespace MultiArrayHelper
+{
+
+    /*****************
+     *   BlockBase   *
+     *****************/
+    
+    template <typename T>
+    BlockBase<T>::BlockBase(size_t size) : mSize(size) {}
+
+    template <typename T>
+    size_t BlockBase<T>::size() const
+    {
+	return mSize;
+    }
+
+    template <typename T>
+    template <class OpFunction>
+    BlockResult<T> BlockBase<T>::operate(const BlockBase& in)
+    {
+	assert(mSize == in.size());
+	OpFunction f;
+	BlockResult<T> res(mSize);
+	for(size_t i = 0; i != mSize; ++i){
+	    res[i] = f(this->operator[](i), in[i]);
+	}
+	return res;
+    }
+
+    /*************
+     *   Block   *
+     *************/
+
+    template <typename T>
+    Block<T>::Block(const std::vector<T>& data,
+		    size_t begPos, size_t size) :
+	BlockBase<T>(size),
+	mBegPtr(data.data() + begPos) {}
+
+    template <typename T>
+    BlockType Block<T>::type() const
+    {
+	return BlockType::BLOCK;
+    }
+    
+    template <typename T>
+    const T& Block<T>::operator[](size_t i) const
+    {
+	return *(mBegPtr + i);
+    }
+    
+    /******************
+     *   BlockValue   *
+     ******************/
+
+    template <typename T>
+    BlockValue<T>::BlockValue(const T& val, size_t size) :
+	BlockBase<T>(size),
+	mVal(val) {}
+
+    template <typename T>
+    BlockType BlockValue<T>::type() const
+    {
+	return BlockType::VALUE;
+    }
+    
+    template <typename T>
+    const T& BlockValue<T>::operator[](size_t i) const
+    {
+	return mVal;
+    }
+    
+    /******************
+     *   SplitBlock   *
+     ******************/
+
+    template <typename T>
+    SplitBlock<T>::SplitBlock(std::vector<T*>&& begPtrVec) :
+	BlockBase<T>(begPtrVec.size()),
+	mBegPtr(begPtrVec) {}
+
+    template <typename T>
+    BlockType SplitBlock<T>::type() const
+    {
+	return BlockType::SPLIT;
+    }
+    
+    template <typename T>
+    const T& SplitBlock<T>::operator[](size_t i) const
+    {
+	return *(mBegPtrVec[i]);
+    }
+    
+    /*******************
+     *   BlockResult   *
+     *******************/
+
+    template <typename T>
+    BlockResult<T>::BlockResult(size_t size) :
+	BlockBase<T>(size),
+	mRes(size) {}
+
+    template <typename T>
+    BlockType BlockResult<T>::type() const
+    {
+	return BlockType::RESULT;
+    }
+    
+    template <typename T>
+    const T& BlockResult<T>::operator[](size_t i) const
+    {
+	return mRes[i];
+    }
+
+    template <typename T>
+    T& BlockResult<T>::operator[](size_t i)
+    {
+	return mRes[i];
+    }
+
+
+    
+} // end namespace MultiArrayHelper
diff --git a/src/block.h b/src/block.h
new file mode 100644
index 0000000..fddf7e3
--- /dev/null
+++ b/src/block.h
@@ -0,0 +1,111 @@
+// -*- C++ -*-
+
+#ifndef __block_h__
+#define __block_h__
+
+#include <cstdlib>
+#include <vector>
+
+#include "base_def.h"
+
+namespace MultiArrayHelper
+{
+
+    enum class BlockType {
+	INDEF = 0,
+	BLOCK = 1,
+	VALUE = 2,
+	SPLIT = 3,
+	RESULT = 4	
+    };
+    
+    // manage vectorization in the future !!
+    
+    template <typename T>
+    class BlockBase
+    {
+    public:
+	BlockBase() = default;
+	BlockBase(size_t size);
+
+	virtual BlockType type() const = 0;
+	
+	virtual size_t size() const;
+	virtual const T& operator[](size_t pos) const = 0;
+
+	template <class OpFunction>
+	BlockResult<T> operate(const BlockBase& in);
+	
+    protected:
+	size_t mSize;
+    };
+
+    template <typename T>
+    class Block : public BlockBase<T>
+    {
+    public:
+	Block() = default;
+	Block(const std::vector<T>& data, size_t begPos, size_t size);
+
+	virtual BlockType type() const override;
+	virtual const T& operator[](size_t pos) const override;
+
+    protected:
+	T* mBegPtr;
+    };
+
+    template <typename T>
+    class BlockValue : public BlockBase<T>
+    {
+    public:
+	BlockValue() = default;
+	BlockValue(const T& val, size_t size);
+
+	virtual BlockType type() const override;
+	virtual const T& operator[](size_t pos) const override;
+
+	virtual BlockBase& set(size_t begPos) override;
+	
+    protected:
+	T mVal;
+    };
+
+    template <typename T>
+    class SplitBlock : public BlockBase<T>
+    {
+    public:
+
+	SplitBlock() = default;
+	SplitBlock(std::vector<T*>&& begPtrVec);
+
+	virtual BlockType type() const override;
+	virtual const T& operator[](size_t pos) const override;
+
+	virtual BlockBase& set(size_t begPos) override;
+	
+    protected:
+	std::vector<T*> mBegPtrVec;
+    };
+
+    template <typename T>
+    class BlockResult : public BlockBase<T>
+    {
+    public:
+	BlockResult() = default;
+	BlockResult(size_t size);
+
+	virtual BlockType type() const override;
+	virtual const T& operator[](size_t pos) const override;
+	virtual T& operator[](size_t i);
+
+	virtual BlockBase& set(size_t begPos) override;
+	
+    protected:
+	std::vector<T> mRes;
+    };
+    
+} // end namespace MultiArrayHelper
+
+#include "block.cc"
+
+#endif
diff --git a/src/multi_array_operation.cc b/src/multi_array_operation.cc
index 7dfbc53..7ca9321 100644
--- a/src/multi_array_operation.cc
+++ b/src/multi_array_operation.cc
@@ -4,7 +4,10 @@
 
 namespace MultiArrayTools
 {
-
+    namespace
+    {
+	using namespace MultiArrayHelper;
+    }
        
     /*********************************
      *   MultiArrayOperationBase     *
@@ -73,13 +76,13 @@ namespace MultiArrayTools
     }
     
     template <typename T, class... Ranges>
-    T& OperationMaster<T,Ranges...>::get()
+    BlockBase<T>& OperationMaster<T,Ranges...>::get(const IndexBase& ind)
     {
 	return mArrayRef.data()[ mIndex->pos() ];
     }
     
     template <typename T, class... Ranges>
-    const T& OperationMaster<T,Ranges...>::get() const
+    const BlockBase<T>& OperationMaster<T,Ranges...>::get(const IndexBase& ind) const
     {
 	return mArrayRef.data()[ mIndex->pos() ];
     }
@@ -99,7 +102,7 @@ namespace MultiArrayTools
     }
 
     template <typename T, class... Ranges>
-    const T& ConstOperationRoot<T,Ranges...>::get() const
+    const BlockBase<T>& ConstOperationRoot<T,Ranges...>::get(const IndexBase& ind) const
     {
 	return mArrayRef[ (*mIndex)() ];
     }
@@ -125,13 +128,13 @@ namespace MultiArrayTools
     }
     
     template <typename T, class... Ranges>
-    const T& OperationRoot<T,Ranges...>::get() const
+    const BlockBase<T>& OperationRoot<T,Ranges...>::get(const IndexBase& ind) const
     {
 	return mArrayRef[ (*mIndex)() ];
     }
 
     template <typename T, class... Ranges>
-    T& OperationRoot<T,Ranges...>::get()
+    BlockBase<T>& OperationRoot<T,Ranges...>::get(const IndexBase& ind)
     {
 	return mArrayRef[ (*mIndex)() ];
     }
@@ -146,7 +149,7 @@ namespace MultiArrayTools
 	mOps(ops...) {}
 
     template <typename T, class OpFunction, class... Ops>
-    const T& Operation<T,OpFunction,Ops...>::get() const
+    const BlockBase<T>& Operation<T,OpFunction,Ops...>::get(const IndexBase& ind) const
     {
 	mRes = PackNum<sizeof...(Ops)-1>::template unpackArgs<T,OpFunction>(mOps);
 	return mRes;
diff --git a/src/multi_array_operation.h b/src/multi_array_operation.h
index 1ddb0c6..01b1261 100644
--- a/src/multi_array_operation.h
+++ b/src/multi_array_operation.h
@@ -12,6 +12,11 @@
 namespace MultiArrayTools
 {
 
+    namespace
+    {
+	using namespace MultiArrayHelper;
+    }
+    
     /*
      * OperationBase
      * MutableOperationBase
@@ -35,8 +40,13 @@ namespace MultiArrayTools
 	OperationBase() = default;
 	virtual ~OperationBase() = default;
 
+	virtual OperationBase& block(const std::shared_ptr<IndexBase>& blockIndex) = 0;
+	
 	//virtual size_t argNum() const = 0;
-	virtual const T& get() const = 0;
+	virtual const BlockBase<T>& get(const IndexBase& ind) const = 0;
+
+    protected:
+ 	mutable std::shared_ptr<BlockBase> mBlockPtr;
     };
    
     template <typename T>
@@ -45,7 +55,7 @@ namespace MultiArrayTools
     public:
 
 	MutableOperationBase() = default;
-	virtual T& get() = 0;
+	virtual BlockBase<T>& get(const IndexBase& ind) = 0;
     };
 
     template <class OperationClass>
@@ -87,8 +97,8 @@ namespace MultiArrayTools
 	OperationMaster(MutableMultiArrayBase<T,Ranges...>& ma, const OperationBase<T>& second,
 			std::shared_ptr<typename CRange::IndexType>& index);
 		
-	virtual T& get() override;
-	virtual const T& get() const override;
+	virtual BlockBase<T>& get(const IndexBase& ind) override;
+	virtual const BlockBase<T>& get(const IndexBase& ind) const override;
 
     protected:
 
@@ -113,7 +123,7 @@ namespace MultiArrayTools
 	ConstOperationRoot(const MultiArrayBase<T,Ranges...>& ma,
 			   const std::shared_ptr<typename Ranges::IndexType>&... indices);
 	
-	virtual const T& get() const override;
+	virtual const BlockBase<T>& get(const IndexBase& ind) const override;
 	
     protected:
 	
@@ -137,8 +147,8 @@ namespace MultiArrayTools
 
 	OperationMaster<T,Ranges...> operator=(const OperationBase<T>& in);
 	
-	virtual const T& get() const override;
-	virtual T& get() override;
+	virtual const BlockBase<T>& get(const IndexBase& ind) const override;
+	virtual BlockBase<T>& get(const IndexBase& ind) override;
 	
     protected:
 	
@@ -158,11 +168,11 @@ namespace MultiArrayTools
 	
 	Operation(const Ops&... ops);
 	
-	virtual const T& get() const override;
+	virtual const BlockBase<T>& get(const IndexBase& ind) const override;
 		
     protected:
 	std::tuple<Ops...> mOps;
-	mutable T mRes;
+	mutable BlockResult<T> mRes;
     };
 
 }