diff --git a/src/base_def.h b/src/base_def.h
index 00a77f4..5200fa0 100644
--- a/src/base_def.h
+++ b/src/base_def.h
@@ -90,7 +90,7 @@ namespace MultiArrayTools
     class MultiArrayOperation;
 
     // slice.h
-    template <typename T, class Range, class MARange, class Index>
+    template <typename T, class Range, class MARange>
     class Slice;
     
 }
diff --git a/src/multi_array_operation.cc b/src/multi_array_operation.cc
index 20353f6..30fc696 100644
--- a/src/multi_array_operation.cc
+++ b/src/multi_array_operation.cc
@@ -25,6 +25,28 @@ namespace MultiArrayTools
      *   MultiArrayOperationBase     *
      *********************************/
 
+    template <typename T, class Range>
+    void MultiArrayOperationRoot<T,Range>::performAssignment(const MultiArrayOperationBase<T>& in)
+    {
+	in.linkIndicesTo(MAOB::mIibPtr);
+	IndexType& iref = dynamic_cast<IndexType&>(*MAOB::mIibPtr);
+	for(iref = mArrayRef.begin().pos(); iref != mArrayRef.end(); ++iref){
+	    // build in vectorization later
+	    get() = in.get();
+	}
+	MAOB::mIibPtr->freeLinked();
+    }
+
+    template <typename T, class Range>
+    template <class RangeX>
+    MultiArrayOperationRoot<T,Range>&
+    MultiArrayOperationRoot<T,Range>::makeSlice(MultiArrayOperationRoot<T,RangeX>& in)
+    {
+	Slice<T,Range,RangeX>& sl = dynamic_cast<Slice<T,Range,RangeX>&>( mArrayRef );
+	sl.set(in.mArrayRef, name(), &in.index(), in.name());
+	return *this;
+    }
+    
     template <typename T, class Range>
     MultiArrayOperationRoot<T,Range>::
     MultiArrayOperationRoot(MultiArrayBase<T,Range>& ma,
@@ -43,39 +65,45 @@ namespace MultiArrayTools
     MultiArrayOperationRoot<T,Range>&
     MultiArrayOperationRoot<T,Range>::operator=(const MultiArrayOperationRoot<T,Range>& in)
     {
-	if(mArrayRef.isSlice()){
-	    Slice<T,Range>& sl = dynamic_cast<Slice<T,Range>&>( mArrayRef );
-	    
-	    sl.set()
-	    return *this;
-	}
-	
-	in.linkIndicesTo(MAOB::mIibPtr);
-	IndexType& iref = dynamic_cast<IndexType&>(*MAOB::mIibPtr);
-
-	for(iref = mArrayRef.begin().pos(); iref != mArrayRef.end(); ++iref){
-	    // build in vectorization later
-	    get() = in.get();
-	}
-	MAOB::mIibPtr->freeLinked();
+	performAssignment(in);
 	return *this;
     }
 
+    template <typename T, class Range>
+    MultiArrayOperationRoot<T,Range>&
+    MultiArrayOperationRoot<T,Range>::operator=(MultiArrayOperationRoot<T,Range>& in)
+    {
+	maketurnSlice(in);
+	if(mArrayRef.isSlice()){
+	    return makeSlice(in);
+	}
+	performAssignment(in);
+	return *this;
+    }
+
+    template <typename T, class Range>
+    template <class Range2>
+    MultiArrayOperationRoot<T,Range>&
+    MultiArrayOperationRoot<T,Range>::operator=(MultiArrayOperationRoot<T,Range2>& in)
+    {
+	if(mArrayRef.isSlice()){
+	    return makeSlice(in);
+	}
+	performAssignment(in);
+	return *this;
+    }
+    
     template <typename T, class Range>
     template <class Operation, class... MAOps>
     MultiArrayOperationRoot<T,Range>&
     MultiArrayOperationRoot<T,Range>::operator=(const MultiArrayOperation<T,Operation,MAOps...>& in)
     {
-	// NO SLICE CREATION !!! (total array not initialized!!)
-	
-	in.linkIndicesTo(MAOB::mIibPtr);
-	IndexType& iref = dynamic_cast<IndexType&>(*MAOB::mIibPtr);
-	
-	for(iref = mArrayRef.begin().pos(); iref != mArrayRef.end(); ++iref){
-	    // build in vectorization later
-	    get() = in.get();
+	if(mArrayRef.isSlice()){
+	    // NO SLICE CREATION !!! (total array not initialized!!)
+	    // throw !
+	    assert(0);
 	}
-	MAOB::mIibPtr->freeLinked();
+   	performAssignment(in);
 	return *this;
     }
 
@@ -153,6 +181,12 @@ namespace MultiArrayTools
 	return mArrayRef[*dynamic_cast<IndexType*>(MAOB::mIibPtr)];
     }
 
+    template <typename T, class Range>
+    const Name& MultiArrayOperationRoot<T,Range>::name() const
+    {
+	return mNm;
+    }
+    
     /*****************************
      *   MultiArrayOperation     *
      *****************************/
diff --git a/src/multi_array_operation.h b/src/multi_array_operation.h
index 11861ad..b1c23ce 100644
--- a/src/multi_array_operation.h
+++ b/src/multi_array_operation.h
@@ -42,6 +42,11 @@ namespace MultiArrayTools
 	MultiArrayOperationRoot(MultiArrayBase<T,Range>& ma, const Name& nm);
 	MultiArrayOperationRoot& operator=(const MultiArrayOperationRoot& in);
 
+	MultiArrayOperationRoot& operator=(MultiArrayOperationRoot& in);
+
+	template <class Range2>
+	MultiArrayOperationRoot& operator=(MultiArrayOperationRoot<T,Range2>& in);
+	
 	template <class Operation, class... MAOps>
 	MultiArrayOperationRoot& operator=(const MultiArrayOperation<T,Operation,MAOps...>& in);
 	
@@ -67,14 +72,24 @@ namespace MultiArrayTools
 
 	virtual size_t argNum() const override;
 
-	//IndexType& index() ;
+	IndexType& index();
 
+	// set index
+	MultiArrayOperationRoot<T,Range>& operator[](const IndexType& ind);
+	
 	virtual void linkIndicesTo(IndefinitIndexBase* target) const override;
 
 	virtual T& get() override;
 	virtual const T& get() const override;
+
+	const Name& name() const;
 	
     protected:
+
+	void performAssignment(const MultiArrayOperationBase<T>& in);
+
+	template <class RangeX>
+	MultiArrayOperationRoot& makeSlice(MultiArrayOperationRoot<T,RangeX>& in);
 	
 	MultiArrayBase<T,Range>& mArrayRef;
 	mutable IndexType mIndex;
diff --git a/src/slice.cc b/src/slice.cc
index aaeeee6..120f807 100644
--- a/src/slice.cc
+++ b/src/slice.cc
@@ -7,8 +7,8 @@ namespace MultiArrayTools
 
     template <typename T, class Range, class MARange>
     Slice<T,Range,MARange,Index>::
-    Slice() :
-	MultiArrayBase<T,Range>(ma.range()),
+    Slice(const Range& range) :
+	MultiArrayBase<T,Range>(range),
 	mMultiArrayRef(*this) {}
 
     template <typename T, class Range, class MARange>
@@ -18,10 +18,16 @@ namespace MultiArrayTools
     }
 
     template <typename T, class Range, class MARange>
-    void Slice<T,Range,MARange,Index>::set(MultiArrayBase<T,MARange>& multiArrayRef, IndefinitIndexBase* MAPtr)
+    void Slice<T,Range,MARange,Index>::set(MultiArrayBase<T,MARange>& multiArrayRef,
+					   const Name& ownNm, // for correct linkage
+					   IndefinitIndexBase* MAPtr, // for desired slice position
+					   const Name& MANm) // for correct linkage)
     {
 	mMultiArrayRef = multiArrayRef;
-	
-	mMAPtr.reset(new typename MARange::IndexType(MAPtr));
+	mMAPtr.reset(new typename MARange::IndexType(*MAPtr));
+	mOwnPtr.reset(new typename Range::IndexType());
+	mMAPtr->name(MANm);
+	mOwnPtr->name(ownNm);
+	mMAPtr->linkTo(mOwnPtr);
     }
 }
diff --git a/src/slice.h b/src/slice.h
index 49b23f3..2486a61 100644
--- a/src/slice.h
+++ b/src/slice.h
@@ -21,7 +21,7 @@ namespace MultiArrayTools
 
 	typedef MultiArrayBase<T,Range> MAB;
 
-	Slice();
+	Slice(const Range& range);
 
 	T& operator[](const typename Range::IndexType& i) override;
 	const T& operator[](const typename Range::IndexType& i) const override;
@@ -34,13 +34,16 @@ namespace MultiArrayTools
 
 	virtual bool isSlice() const override;
 
-	void set(MultiArrayBase<T,MARange>& multiArrayRef, IndefinitIndexBase* MAPtr);
+	void set(MultiArrayBase<T,MARange>& multiArrayRef,
+		 const Name& ownNm,
+		 IndefinitIndexBase* MAPtr,
+		 const Name& MANm);
 	
     private:
 
 	MultiArrayBase<T,MARange>& mMultiArrayRef;
 	std::shared_ptr<IndefinitIndexBase> mMAPtr; // idx ptr for original MA Range
-	IndefinitIndexBase* mOwnPtr; // idx ptr for own Range
+	std::shared_ptr<IndefinitIndexBase> mOwnPtr; // idx ptr for own Range
 	//Index mSlicePos;
     };