diff --git a/ApplicationCode/Application/CMakeLists_files.cmake b/ApplicationCode/Application/CMakeLists_files.cmake
index 9274ba491c..775405cd0e 100644
--- a/ApplicationCode/Application/CMakeLists_files.cmake
+++ b/ApplicationCode/Application/CMakeLists_files.cmake
@@ -9,6 +9,7 @@ ${CEE_CURRENT_LIST_DIR}RiaApplication.h
 ${CEE_CURRENT_LIST_DIR}RiaDefines.h
 ${CEE_CURRENT_LIST_DIR}RiaPreferences.h
 ${CEE_CURRENT_LIST_DIR}RiaPorosityModel.h
+${CEE_CURRENT_LIST_DIR}RiaSummaryCurveDefinition.h
 )
 
 set (SOURCE_GROUP_SOURCE_FILES
@@ -17,6 +18,7 @@ ${CEE_CURRENT_LIST_DIR}RiaDefines.cpp
 ${CEE_CURRENT_LIST_DIR}RiaMain.cpp
 ${CEE_CURRENT_LIST_DIR}RiaPreferences.cpp
 ${CEE_CURRENT_LIST_DIR}RiaPorosityModel.cpp
+${CEE_CURRENT_LIST_DIR}RiaSummaryCurveDefinition.cpp
 )
 
 list(APPEND CODE_HEADER_FILES
diff --git a/ApplicationCode/Application/RiaSummaryCurveDefinition.cpp b/ApplicationCode/Application/RiaSummaryCurveDefinition.cpp
new file mode 100644
index 0000000000..b94f6066b5
--- /dev/null
+++ b/ApplicationCode/Application/RiaSummaryCurveDefinition.cpp
@@ -0,0 +1,57 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2017     Statoil ASA
+// 
+//  ResInsight is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+// 
+//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
+//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.
+// 
+//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html> 
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+
+#include "RiaSummaryCurveDefinition.h"
+
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+RiaSummaryCurveDefinition::RiaSummaryCurveDefinition(RimSummaryCase* summaryCase, const RifEclipseSummaryAddress& summaryAddress)
+{
+    m_curveDefinition = std::make_pair(summaryCase, summaryAddress);
+}
+
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+RimSummaryCase* RiaSummaryCurveDefinition::summaryCase() const
+{
+    return m_curveDefinition.first;
+}
+
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+const RifEclipseSummaryAddress& RiaSummaryCurveDefinition::summaryAddress() const
+{
+    return m_curveDefinition.second;
+}
+
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+bool RiaSummaryCurveDefinition::operator<(const RiaSummaryCurveDefinition& other) const
+{
+    if (m_curveDefinition.first == other.summaryCase())
+    {
+        return (m_curveDefinition.second < other.summaryAddress());
+    }
+
+    return (m_curveDefinition.first < other.summaryCase());
+}
+
diff --git a/ApplicationCode/Application/RiaSummaryCurveDefinition.h b/ApplicationCode/Application/RiaSummaryCurveDefinition.h
new file mode 100644
index 0000000000..5e81022c41
--- /dev/null
+++ b/ApplicationCode/Application/RiaSummaryCurveDefinition.h
@@ -0,0 +1,42 @@
+/////////////////////////////////////////////////////////////////////////////////
+//
+//  Copyright (C) 2017     Statoil ASA
+// 
+//  ResInsight is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+// 
+//  ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
+//  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+//  FITNESS FOR A PARTICULAR PURPOSE.
+// 
+//  See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html> 
+//  for more details.
+//
+/////////////////////////////////////////////////////////////////////////////////
+
+#pragma once
+
+#include "RifEclipseSummaryAddress.h"
+
+#include <utility>
+
+class RimSummaryCase;
+
+//==================================================================================================
+/// 
+//==================================================================================================
+class RiaSummaryCurveDefinition
+{
+public:
+    explicit RiaSummaryCurveDefinition(RimSummaryCase* summaryCase, const RifEclipseSummaryAddress& summaryAddress);
+
+    RimSummaryCase*                 summaryCase() const;
+    const RifEclipseSummaryAddress& summaryAddress() const;
+
+    bool operator < (const RiaSummaryCurveDefinition& other) const;
+
+private:
+    std::pair<RimSummaryCase*, RifEclipseSummaryAddress> m_curveDefinition;
+};