diff --git a/Code/Mantid/Framework/API/CMakeLists.txt b/Code/Mantid/Framework/API/CMakeLists.txt
index 1380797cf9153864b405b01c92cef538858b4fdb..4520823c4829c4cf05ee7e4f112b97c821ac1dae 100644
--- a/Code/Mantid/Framework/API/CMakeLists.txt
+++ b/Code/Mantid/Framework/API/CMakeLists.txt
@@ -40,7 +40,7 @@ set ( SRC_FILES
src/FunctionDomain1D.cpp
src/FunctionDomainMD.cpp
src/FunctionFactory.cpp
- src/FunctionParameterDecorator.cpp
+ src/FunctionParameterDecorator.cpp
src/FunctionProperty.cpp
src/FunctionValues.cpp
src/GridDomain.cpp
@@ -61,6 +61,7 @@ set ( SRC_FILES
src/IMDHistoWorkspace.cpp
src/IMDIterator.cpp
src/IMDWorkspace.cpp
+ src/IPawleyFunction.cpp
src/IPeak.cpp
src/IPeakFunction.cpp
src/IPeaksWorkspace.cpp
@@ -184,7 +185,7 @@ set ( INC_FILES
inc/MantidAPI/FunctionDomain1D.h
inc/MantidAPI/FunctionDomainMD.h
inc/MantidAPI/FunctionFactory.h
- inc/MantidAPI/FunctionParameterDecorator.h
+ inc/MantidAPI/FunctionParameterDecorator.h
inc/MantidAPI/FunctionProperty.h
inc/MantidAPI/FunctionValues.h
inc/MantidAPI/GridDomain.h
@@ -217,6 +218,7 @@ set ( INC_FILES
inc/MantidAPI/IMDNode.h
inc/MantidAPI/IMDWorkspace.h
inc/MantidAPI/IMaskWorkspace.h
+ inc/MantidAPI/IPawleyFunction.h
inc/MantidAPI/IPeak.h
inc/MantidAPI/IPeakFunction.h
inc/MantidAPI/IPeaksWorkspace.h
@@ -325,8 +327,8 @@ set ( TEST_FILES
FuncMinimizerFactoryTest.h
FunctionAttributeTest.h
FunctionDomainTest.h
- FunctionParameterDecoratorTest.h
FunctionFactoryTest.h
+ FunctionParameterDecoratorTest.h
FunctionPropertyTest.h
FunctionTest.h
FunctionValuesTest.h
diff --git a/Code/Mantid/Framework/API/inc/MantidAPI/IPawleyFunction.h b/Code/Mantid/Framework/API/inc/MantidAPI/IPawleyFunction.h
new file mode 100644
index 0000000000000000000000000000000000000000..f560667902f0fcfd7acb7e3269363875c7e66791
--- /dev/null
+++ b/Code/Mantid/Framework/API/inc/MantidAPI/IPawleyFunction.h
@@ -0,0 +1,80 @@
+#ifndef MANTID_API_IPAWLEYFUNCTION_H_
+#define MANTID_API_IPAWLEYFUNCTION_H_
+
+#include "MantidAPI/DllConfig.h"
+#include "MantidAPI/FunctionParameterDecorator.h"
+#include "MantidAPI/IPeakFunction.h"
+
+namespace Mantid {
+namespace API {
+
+/** IPawleyFunction
+
+ This abstract class defines the interface of a PawleyFunction. An
+ implementation can be found in CurveFitting/PawleyFunction. This interface
+ exists so that the function can be used in modules outside CurveFitting.
+
+ @author Michael Wedel, Paul Scherrer Institut - SINQ
+ @date 11/03/2015
+
+ Copyright © 2015 PSI-NXMM
+
+ This file is part of Mantid.
+
+ Mantid 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.
+
+ Mantid 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 for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+ File change history is stored at: <https://github.com/mantidproject/mantid>
+ Code Documentation is available at: <http://doxygen.mantidproject.org>
+*/
+class MANTID_API_DLL IPawleyFunction : public FunctionParameterDecorator {
+public:
+ IPawleyFunction();
+ /// Virtual destructor.
+ virtual ~IPawleyFunction() {}
+
+ /// A string that names the crystal system.
+ virtual void setCrystalSystem(const std::string &crystalSystem) = 0;
+
+ /// Sets the name of the profile function used for the reflections.
+ virtual void setProfileFunction(const std::string &profileFunction) = 0;
+
+ /// Set the function parameters according to the supplied unit cell.
+ virtual void setUnitCell(const std::string &unitCellString) = 0;
+
+ /// Assign several peaks with the same fwhm/height parameters.
+ virtual void setPeaks(const std::vector<Kernel::V3D> &hkls, double fwhm,
+ double height) = 0;
+
+ /// Removes all peaks from the function.
+ virtual void clearPeaks() = 0;
+
+ /// Add a peak with the given parameters.
+ virtual void addPeak(const Kernel::V3D &hkl, double fwhm, double height) = 0;
+
+ /// Returns the number of peaks in the function
+ virtual size_t getPeakCount() const = 0;
+
+ /// Returns the profile function stored for the i-th peak.
+ virtual IPeakFunction_sptr getPeakFunction(size_t i) const = 0;
+
+ /// Returns the Miller indices stored for the i-th peak.
+ virtual Kernel::V3D getPeakHKL(size_t i) const = 0;
+};
+
+typedef boost::shared_ptr<IPawleyFunction> IPawleyFunction_sptr;
+
+} // namespace API
+} // namespace Mantid
+
+#endif /* MANTID_API_IPAWLEYFUNCTION_H_ */
diff --git a/Code/Mantid/Framework/API/src/IPawleyFunction.cpp b/Code/Mantid/Framework/API/src/IPawleyFunction.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..caeae3cf971ea985f2ac294af5c778c749e345e5
--- /dev/null
+++ b/Code/Mantid/Framework/API/src/IPawleyFunction.cpp
@@ -0,0 +1,9 @@
+#include "MantidAPI/IPawleyFunction.h"
+
+namespace Mantid {
+namespace API {
+/// Default constructor
+IPawleyFunction::IPawleyFunction() : FunctionParameterDecorator() {}
+
+} // namespace API
+} // namespace Mantid
diff --git a/Code/Mantid/Framework/CurveFitting/inc/MantidCurveFitting/PawleyFunction.h b/Code/Mantid/Framework/CurveFitting/inc/MantidCurveFitting/PawleyFunction.h
index cb0e9fb7acae149213d0e76acb2d45c81e135a4a..441ea1ff7b0366ca45f88dfa8259eb3f139fbf3b 100644
--- a/Code/Mantid/Framework/CurveFitting/inc/MantidCurveFitting/PawleyFunction.h
+++ b/Code/Mantid/Framework/CurveFitting/inc/MantidCurveFitting/PawleyFunction.h
@@ -3,7 +3,7 @@
#include "MantidKernel/System.h"
#include "MantidAPI/CompositeFunction.h"
-#include "MantidAPI/FunctionParameterDecorator.h"
+#include "MantidAPI/IPawleyFunction.h"
#include "MantidAPI/MatrixWorkspace.h"
#include "MantidAPI/IPeakFunction.h"
#include "MantidAPI/ParamFunction.h"
@@ -106,7 +106,7 @@ typedef boost::shared_ptr<PawleyParameterFunction> PawleyParameterFunction_sptr;
File change history is stored at: <https://github.com/mantidproject/mantid>
Code Documentation is available at: <http://doxygen.mantidproject.org>
*/
-class DLLExport PawleyFunction : public API::FunctionParameterDecorator {
+class DLLExport PawleyFunction : public API::IPawleyFunction {
public:
PawleyFunction();
virtual ~PawleyFunction() {}
diff --git a/Code/Mantid/Framework/CurveFitting/src/PawleyFunction.cpp b/Code/Mantid/Framework/CurveFitting/src/PawleyFunction.cpp
index 58f597657779b5a42010fba68d7f23a0acfd4a13..b54db9de6e7ba28d3e7084d05b49d98d24f0f134 100644
--- a/Code/Mantid/Framework/CurveFitting/src/PawleyFunction.cpp
+++ b/Code/Mantid/Framework/CurveFitting/src/PawleyFunction.cpp
@@ -267,7 +267,7 @@ DECLARE_FUNCTION(PawleyFunction)
/// Constructor
PawleyFunction::PawleyFunction()
- : FunctionParameterDecorator(), m_compositeFunction(),
+ : IPawleyFunction(), m_compositeFunction(),
m_pawleyParameterFunction(), m_peakProfileComposite(), m_hkls(),
m_dUnit(), m_wsUnit() {}