diff --git a/apps/opencs/model/world/columns.hpp b/apps/opencs/model/world/columns.hpp
index 56362e4cdb..4d0ecb58eb 100644
--- a/apps/opencs/model/world/columns.hpp
+++ b/apps/opencs/model/world/columns.hpp
@@ -14,6 +14,18 @@ namespace CSMWorld
         {
             return record.get().mValue;
         }
+
+        virtual void set (Record<ESXRecordT>& record, const QVariant& data)
+        {
+            ESXRecordT base = record.getBase();
+            base.mValue = data.toFloat();
+            record.setModified (base);
+        }
+
+        virtual bool isEditable() const
+        {
+            return true;
+        }
     };
 
 }
diff --git a/apps/opencs/model/world/idcollection.hpp b/apps/opencs/model/world/idcollection.hpp
index 0bddda1ac9..ee6a4b2ce8 100644
--- a/apps/opencs/model/world/idcollection.hpp
+++ b/apps/opencs/model/world/idcollection.hpp
@@ -23,6 +23,10 @@ namespace CSMWorld
         virtual ~Column() {}
 
         virtual QVariant get (const Record<ESXRecordT>& record) const = 0;
+
+        virtual void set (Record<ESXRecordT>& record, const QVariant& data) = 0;
+
+        virtual bool isEditable() const = 0;
     };
 
     class IdCollectionBase
@@ -46,6 +50,10 @@ namespace CSMWorld
             virtual std::string getTitle (int column) const = 0;
 
             virtual QVariant getData (int index, int column) const = 0;
+
+            virtual void setData (int index, int column, const QVariant& data) = 0;
+
+            virtual bool isEditable (int column) const = 0;
     };
 
     ///< \brief Collection of ID-based records
@@ -77,9 +85,13 @@ namespace CSMWorld
 
             virtual QVariant getData (int index, int column) const;
 
+            virtual void setData (int index, int column, const QVariant& data);
+
             virtual std::string getTitle (int column) const;
 
-            virtual void addColumn (Column<ESXRecordT> *column);
+            virtual bool isEditable (int column) const;
+
+            void addColumn (Column<ESXRecordT> *column);
     };
 
     template<typename ESXRecordT>
@@ -142,12 +154,24 @@ namespace CSMWorld
         return mColumns.at (column)->get (mRecords.at (index));
     }
 
+    template<typename ESXRecordT>
+    void IdCollection<ESXRecordT>::setData (int index, int column, const QVariant& data)
+    {
+        return mColumns.at (column)->set (mRecords.at (index), data);
+    }
+
     template<typename ESXRecordT>
     std::string IdCollection<ESXRecordT>::getTitle (int column) const
     {
         return mColumns.at (column)->mTitle;
     }
 
+    template<typename ESXRecordT>
+    bool IdCollection<ESXRecordT>::isEditable (int column) const
+    {
+        return mColumns.at (column)->isEditable();
+    }
+
     template<typename ESXRecordT>
     void IdCollection<ESXRecordT>::addColumn (Column<ESXRecordT> *column)
     {
diff --git a/apps/opencs/model/world/idtable.cpp b/apps/opencs/model/world/idtable.cpp
index f8acd4f9fe..8fdc4fb8ff 100644
--- a/apps/opencs/model/world/idtable.cpp
+++ b/apps/opencs/model/world/idtable.cpp
@@ -31,9 +31,18 @@ int CSMWorld::IdTable::columnCount (const QModelIndex & parent) const
 
 QVariant CSMWorld::IdTable::data  (const QModelIndex & index, int role) const
 {
-    if (role!=Qt::DisplayRole)
+    if (role!=Qt::DisplayRole && role!=Qt::EditRole)
         return QVariant();
 
+    if (role==Qt::EditRole)
+    {
+        if (index.column()==0)
+            return QVariant();
+
+        if (!mIdCollection->isEditable (index.column()-1))
+            return QVariant();
+    }
+
     if (index.column()==0)
         return QVariant (tr (mIdCollection->getId (index.row()).c_str()));
 
@@ -52,4 +61,26 @@ QVariant CSMWorld::IdTable::headerData (int section, Qt::Orientation orientation
         return QVariant (tr ("ID"));
 
     return tr (mIdCollection->getTitle (section-1).c_str());
+}
+
+bool CSMWorld::IdTable::setData ( const QModelIndex &index, const QVariant &value, int role)
+{
+    if (index.column()>0 && role==Qt::EditRole)
+    {
+        mIdCollection->setData (index.row(), index.column()-1, value);
+        emit dataChanged (index, index);
+        return true;
+    }
+
+    return false;
+}
+
+Qt::ItemFlags CSMWorld::IdTable::flags (const QModelIndex & index) const
+{
+    Qt::ItemFlags flags = Qt::ItemIsSelectable | Qt::ItemIsEnabled;
+
+    if (index.column()>0)
+        flags |= Qt::ItemIsEditable;
+
+    return flags;
 }
\ No newline at end of file
diff --git a/apps/opencs/model/world/idtable.hpp b/apps/opencs/model/world/idtable.hpp
index 4fb939fa31..30af3aaf70 100644
--- a/apps/opencs/model/world/idtable.hpp
+++ b/apps/opencs/model/world/idtable.hpp
@@ -31,6 +31,10 @@ namespace CSMWorld
             QVariant data  (const QModelIndex & index, int role = Qt::DisplayRole) const;
 
             QVariant headerData (int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
+
+            bool setData ( const QModelIndex &index, const QVariant &value, int role = Qt::EditRole);
+
+            Qt::ItemFlags flags (const QModelIndex & index) const;
     };
 }
 
diff --git a/apps/opencs/model/world/record.hpp b/apps/opencs/model/world/record.hpp
index 230d39eb06..950d7f176e 100644
--- a/apps/opencs/model/world/record.hpp
+++ b/apps/opencs/model/world/record.hpp
@@ -8,7 +8,7 @@ namespace CSMWorld
     template <typename ESXRecordT>
     struct Record
     {
-        enum state
+        enum State
         {
             State_BaseOnly, // defined in base only
             State_Modified, // exists in base, but has been modified
@@ -18,7 +18,7 @@ namespace CSMWorld
 
         ESXRecordT mBase;
         ESXRecordT mModified;
-        state mState;
+        State mState;
 
         bool isDeleted() const;
 
@@ -27,10 +27,11 @@ namespace CSMWorld
         const ESXRecordT& get() const;
         ///< Throws an exception, if the record is deleted.
 
-        ESXRecordT& get();
-        ///< Throws an exception, if the record is deleted.
+        const ESXRecordT& getBase() const;
+        ///< Throws an exception, if the record is deleted. Returns modified, if there is no base.
 
         void setModified (const ESXRecordT& modified);
+        ///< Throws an exception, if the record is deleted.
     };
 
     template <typename ESXRecordT>
@@ -55,21 +56,24 @@ namespace CSMWorld
     }
 
     template <typename ESXRecordT>
-    ESXRecordT& Record<ESXRecordT>::get()
+    const ESXRecordT& Record<ESXRecordT>::getBase() const
     {
         if (isDeleted())
             throw std::logic_error ("attempt to access a deleted record");
 
-        return mState==State_BaseOnly ? mBase : mModified;
+        return mState==State_ModifiedOnly ? mModified : mBase;
     }
 
     template <typename ESXRecordT>
     void Record<ESXRecordT>::setModified (const ESXRecordT& modified)
     {
+        if (isDeleted())
+            throw std::logic_error ("attempt to modify a deleted record");
+
         mModified = modified;
 
         if (mState!=State_ModifiedOnly)
-            mState = State_Modified;
+            mState = mBase==mModified ? State_BaseOnly : State_Modified;
     }
 }
 
diff --git a/components/esm/loadglob.cpp b/components/esm/loadglob.cpp
index 39c07fb310..0335da0df3 100644
--- a/components/esm/loadglob.cpp
+++ b/components/esm/loadglob.cpp
@@ -44,4 +44,8 @@ void Global::save(ESMWriter &esm)
     esm.writeHNT("FLTV", mValue);
 }
 
+    bool operator== (const Global& left, const Global& right)
+    {
+        return left.mId==right.mId && left.mValue==right.mValue && left.mType==right.mType;
+    }
 }
diff --git a/components/esm/loadglob.hpp b/components/esm/loadglob.hpp
index 5cfb3c87b7..5c5dafaecb 100644
--- a/components/esm/loadglob.hpp
+++ b/components/esm/loadglob.hpp
@@ -24,5 +24,8 @@ struct Global
     void load(ESMReader &esm);
     void save(ESMWriter &esm);
 };
+
+bool operator== (const Global& left, const Global& right);
+
 }
 #endif