diff --git a/src/simplugin.h b/src/simplugin.h
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--- /dev/null
+++ b/src/simplugin.h
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+/*
+ *
+ *  $Id$
+ *
+ *  This file is part of the Virtual Leaf.
+ *
+ *  The Virtual Leaf 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.
+ *
+ *  The Virtual Leaf 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 the Virtual Leaf.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *  Copyright 2010 Roeland Merks.
+ *
+ */
+
+
+#ifndef _SIMPLUGIN_H_
+#define _SIMPLUGIN_H_
+
+#include <QtPlugin>
+#include <QMetaType>
+#include "cellbase.h"
+#include "wallbase.h"
+
+class Parameter;
+
+#include <QColor>
+#include <QString>
+
+
+class SimPluginInterface {
+
+public:
+	virtual QString ModelID(void) = 0; 
+	
+	virtual ~SimPluginInterface() { }
+
+	// Executed after the cellular mechanics steps have equillibrized
+	virtual void CellHouseKeeping(CellBase &c) = 0;
+	
+	// Differential equations describing transport of chemicals from cell to cell
+	virtual void CelltoCellTransport(Wall *, double *dchem_c1, double *dchem_c2) = 0;
+	
+	// Differential equations describing chemical reactions taking place at or near the cell walls
+	// (e.g. PIN accumulation)
+	virtual void WallDynamics(Wall *w, double *dw1, double *dw)  = 0;
+	
+	// Differential equations describing chemical reactions inside the cells
+	virtual void CellDynamics(CellBase *c, double *dchem) = 0;
+
+	// to be executed after a cell division
+	virtual void OnDivide(ParentInfo &parent_info, CellBase &daughter1, CellBase &daughter2) = 0;
+	
+	// to be executed for coloring a cell
+	virtual void SetCellColor(CellBase &c, QColor &color) = 0;
+	
+	// Number of chemicals
+	virtual int NChem(void) = 0;
+	
+	// For internal use; not to be redefined by end users
+	virtual void SetParameters(Parameter *pass_pars);// { par = pass_pars; }
+	virtual void SetCellsStaticDatamembers (CellsStaticDatamembers *cells_static_data_members_of_main);
+
+protected:
+	class Parameter *par;
+	
+};
+
+Q_DECLARE_INTERFACE(SimPluginInterface, 
+                    "nl.cwi.VirtualLeaf.SimPluginInterface/1.1") 
+Q_DECLARE_METATYPE(SimPluginInterface *)
+
+
+#endif
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