diff --git a/src/builder/ExplicitDFTModelBuilder.cpp b/src/builder/ExplicitDFTModelBuilder.cpp
index 1b777fb54..9332044f2 100644
--- a/src/builder/ExplicitDFTModelBuilder.cpp
+++ b/src/builder/ExplicitDFTModelBuilder.cpp
@@ -77,7 +77,6 @@ namespace storm {
             while (!stateQueue.empty()) {
                 // Initialization
                 outgoingTransitions.clear();
-                ValueType sum = storm::utility::zero<ValueType>();
 
                 // Consider next state
                 DFTStatePointer state = stateQueue.front();
@@ -147,7 +146,9 @@ namespace storm {
                     bool isUsed = true;
                     if (mDft.hasRepresentant(nextBE->id())) {
                         DFTElementPointer representant = mDft.getRepresentant(nextBE->id());
-                        isUsed = newState->isUsed(representant->id());
+                        // Used must be checked for the state we are coming from as this state is responsible for the
+                        // rate and not the new state we are going to
+                        isUsed = state->isUsed(representant->id());
                     }
                     STORM_LOG_TRACE("BE " << nextBE->name() << " is " << (isUsed ? "used" : "not used"));
                     ValueType rate = isUsed ? nextBE->activeFailureRate() : nextBE->passiveFailureRate();
@@ -155,20 +156,18 @@ namespace storm {
                     if (resultFind != outgoingTransitions.end()) {
                         // Add to existing transition
                         resultFind->second += rate;
+                        STORM_LOG_TRACE("Updated transition from " << state->getId() << " to " << resultFind->first << " with " << rate << " to " << resultFind->second);
                     } else {
                         // Insert new transition
                         outgoingTransitions.insert(std::make_pair(newState->getId(), rate));
+                        STORM_LOG_TRACE("Added transition from " << state->getId() << " to " << newState->getId() << " with " << rate);
                     }
-                    sum += rate;
                 } // end while failing BE
 
                 // Add all transitions
                 for (auto it = outgoingTransitions.begin(); it != outgoingTransitions.end(); ++it)
                 {
-                    // TODO Matthias: correct?
-                    ValueType rate = it->second;// / sum;
-                    transitionMatrixBuilder.addNextValue(state->getId(), it->first, rate);
-                    STORM_LOG_TRACE("Added transition from " << state->getId() << " to " << it->first << " with " << rate);
+                    transitionMatrixBuilder.addNextValue(state->getId(), it->first, it->second);
                 }
 
             } // end while queue
diff --git a/src/storage/dft/DFTBuilder.cpp b/src/storage/dft/DFTBuilder.cpp
index 870b7f8bf..fd068bf7c 100644
--- a/src/storage/dft/DFTBuilder.cpp
+++ b/src/storage/dft/DFTBuilder.cpp
@@ -16,15 +16,14 @@ namespace storm {
         template<typename ValueType>
         DFT<ValueType> DFTBuilder<ValueType>::build() {
             for(auto& elem : mChildNames) {
+                DFTGatePointer gate = std::static_pointer_cast<DFTGate<ValueType>>(elem.first);
                 for(auto const& child : elem.second) {
-                    DFTGatePointer gate = std::static_pointer_cast<DFTGate<ValueType>>(elem.first);
                     gate->pushBackChild(mElements[child]);
                     mElements[child]->addParent(gate);
                 }
             }
 
             // Sort elements topologically
-
             // compute rank
             for (auto& elem : mElements) {
                 computeRank(elem.second);
diff --git a/src/storage/dft/DFTElements.h b/src/storage/dft/DFTElements.h
index daa1d3d54..7f92ebb19 100644
--- a/src/storage/dft/DFTElements.h
+++ b/src/storage/dft/DFTElements.h
@@ -657,13 +657,7 @@ namespace storm {
                 if(state.isOperational(this->mId)) {
                     size_t uses = state.extractUses(mUseIndex);
                     if(!state.isOperational(uses)) {
-                        // TODO compute children ids before.
-                        std::vector<size_t> childrenIds;
-                        for(auto const& child : this->mChildren) {
-                            childrenIds.push_back(child->id());
-                        }
-                        
-                        bool claimingSuccessful = state.claimNew(this->mId, mUseIndex, uses, childrenIds);
+                        bool claimingSuccessful = state.claimNew(this->mId, mUseIndex, uses, this->mChildren);
                         if(!claimingSuccessful) {
                             this->fail(state, queues);
                         }
diff --git a/src/storage/dft/DFTState.cpp b/src/storage/dft/DFTState.cpp
index ebf3c770b..d760129e0 100644
--- a/src/storage/dft/DFTState.cpp
+++ b/src/storage/dft/DFTState.cpp
@@ -134,15 +134,19 @@ namespace storm {
         }
 
         template<typename ValueType>
-        bool DFTState<ValueType>::claimNew(size_t spareId, size_t usageIndex, size_t currentlyUses, std::vector<size_t> const& childIds) {
-            auto it = find(childIds.begin(), childIds.end(), currentlyUses);
-            assert(it != childIds.end());
+        bool DFTState<ValueType>::claimNew(size_t spareId, size_t usageIndex, size_t currentlyUses, std::vector<std::shared_ptr<DFTElement<ValueType>>> const& children) {
+            auto it = children.begin();
+            while ((*it)->id() != currentlyUses) {
+                assert(it != children.end());
+                ++it;
+            }
             ++it;
-            while(it != childIds.end()) {
-                if(!hasFailed(*it) && !isUsed(*it)) {
-                    setUsesAtPosition(usageIndex, *it);
+            while(it != children.end()) {
+                size_t childId = (*it)->id();
+                if(!hasFailed(childId) && !isUsed(childId)) {
+                    setUsesAtPosition(usageIndex, childId);
                     if(isActiveSpare(spareId)) {
-                        mDft.propagateActivation(*this,*it);
+                        mDft.propagateActivation(*this, childId);
                     }
                     return true;
                 }
diff --git a/src/storage/dft/DFTState.h b/src/storage/dft/DFTState.h
index 4ea11a991..7cb5eaf4a 100644
--- a/src/storage/dft/DFTState.h
+++ b/src/storage/dft/DFTState.h
@@ -13,6 +13,8 @@ namespace storm {
         class DFT;
         template<typename ValueType>
         class DFTBE;
+        template<typename ValueType>
+        class DFTElement;
 
         template<typename ValueType>
         class DFTState {
@@ -97,7 +99,7 @@ namespace storm {
              */
             void setUsesAtPosition(size_t usageIndex, size_t child);
             
-            bool claimNew(size_t spareId, size_t usageIndex, size_t currentlyUses, std::vector<size_t> const& childIds);
+            bool claimNew(size_t spareId, size_t usageIndex, size_t currentlyUses, std::vector<std::shared_ptr<DFTElement<ValueType>>> const& children);
             
             bool hasOutgoingEdges() const {
                 return !mIsCurrentlyFailableBE.empty();