diff --git a/Cantera/src/ResidEval.h b/Cantera/src/ResidEval.h
index 1cc04af15..5ca3726b6 100755
--- a/Cantera/src/ResidEval.h
+++ b/Cantera/src/ResidEval.h
@@ -35,8 +35,10 @@ namespace Cantera {
          * @param ydot rate of change of solution vector. (input, do
          * not modify)
          */
-	virtual void evalResid(double t, const double* y, 
-            const double* ydot, double* resid)=0;
+	virtual void evalResid(double t, const double deltaT, 
+			       const double* y,
+			       const double* ydot,
+			       double* resid)=0;
 
         /** Number of equations. */
         virtual int neq()=0;
@@ -45,12 +47,68 @@ namespace Cantera {
         virtual double* solution()=0;
         virtual double* solution_dot()=0;
 
+        /**
+         *       Fill the solution vector with the initial conditions
+         *       at initial time t0.
+         */
+        virtual void getInitialConditions(double t0, size_t leny, double* y)=0;
+
+        /**
+         *      Report the analytical result if available and describe
+         *      how close the numerical solution is to the analytical
+         *      solution
+         */
+        virtual void analytical_solution(double, double *)=0;
+        virtual void analytical_solution_dot(double, double *)=0;
+
+        /**
+         *      Write out to a file or to standard output the current solution
+         *      ievent  is a description of the event that caused this
+         *      function to be called.
+         */
+        virtual void writeSolution(int ievent, double t,
+                                   const double *y, const double *ydot) = 0;
+
+        /**
+         *     Apply a filter
+         */
+        virtual void applyFilter(const double time, const double deltaT,
+                                 const double *ydot, const double *y,
+                                 double *ydot) = 0;
+
+        /**
+         *      Write out to a file or to standard output the current solution
+         *      ievent  is a description of the event that caused this
+         *      function to be called.
+         */
+        virtual void writeSolutionFilter(int ievent, double t,
+                                         const double * const y,
+                                         const double * const ydot,
+                                         const double * const delta_y,
+                                         const char * const fname) = 0;
+
+	/**
+         * This function returns a value of the delta t constraint
+         * that may exist in the problem.
+         *
+         */
+        virtual double delta_t_constraint(const double t, const double *y,
+                                          const double *ydot) = 0;
+
+        virtual void adjustAtol(double *) = 0;
+
+	/**
+	 * This function may be used to create output at various points in the
+	 * execution of an application.
+	 *
+	 */
+        virtual void user_out(const int ifunc, const double t, const double *y,
+                              const double *ydot) = 0;
+
     protected:
 
     private:
 
     };
-
 }
-
 #endif