diff --git a/Cantera/src/transport/AqueousTransport.h b/Cantera/src/transport/AqueousTransport.h
index 446701ddb..07e3e3dd9 100644
--- a/Cantera/src/transport/AqueousTransport.h
+++ b/Cantera/src/transport/AqueousTransport.h
@@ -135,7 +135,7 @@ namespace Cantera {
     virtual ~AqueousTransport() {}
 
     //! Return the model id for this transport parameterization
-    virtual int model() { return cAqueousTransport; }
+    virtual int model() const { return cAqueousTransport; }
 
     //! overloaded base class methods
 
diff --git a/Cantera/src/transport/DustyGasTransport.h b/Cantera/src/transport/DustyGasTransport.h
index aaedc9947..e28fa4ae5 100644
--- a/Cantera/src/transport/DustyGasTransport.h
+++ b/Cantera/src/transport/DustyGasTransport.h
@@ -40,7 +40,7 @@ namespace Cantera {
         //---------------------------------------------------------
         // overloaded base class methods
 
-        virtual int model() { return cDustyGasTransport; }
+        virtual int model() const { return cDustyGasTransport; }
 
         virtual void setParameters(const int type, const int k, const doublereal* const p);
         
diff --git a/Cantera/src/transport/LiquidTransport.cpp b/Cantera/src/transport/LiquidTransport.cpp
index aa2f0a3da..8175c32eb 100644
--- a/Cantera/src/transport/LiquidTransport.cpp
+++ b/Cantera/src/transport/LiquidTransport.cpp
@@ -926,4 +926,20 @@ namespace Cantera {
       }
     }
   }
+
+
+  /**
+   * Throw an exception if this method is invoked. 
+   * This probably indicates something is not yet implemented.
+   */
+    doublereal LiquidTransport::err(std::string msg) const {
+      throw CanteraError("Liquid Transport Class",
+			 "\n\n\n**** Method "+ msg +" not implemented in model "
+			 + int2str(model()) + " ****\n"
+			 "(Did you forget to specify a transport model?)\n\n\n");
+      
+      return 0.0;
+    }
+
+
 }
diff --git a/Cantera/src/transport/LiquidTransport.h b/Cantera/src/transport/LiquidTransport.h
index 06f93bb37..852641192 100644
--- a/Cantera/src/transport/LiquidTransport.h
+++ b/Cantera/src/transport/LiquidTransport.h
@@ -193,7 +193,7 @@ namespace Cantera {
 
 
     //! Return the model id for this transport parameterization
-    virtual int model() {
+    virtual int model() const {
       return cLiquidTransport; 
     }
 
diff --git a/Cantera/src/transport/MixTransport.h b/Cantera/src/transport/MixTransport.h
index a7558ca42..18a781577 100755
--- a/Cantera/src/transport/MixTransport.h
+++ b/Cantera/src/transport/MixTransport.h
@@ -51,7 +51,7 @@ namespace Cantera {
 
     virtual ~MixTransport() {}
 
-    virtual int model() { return cMixtureAveraged; }
+    virtual int model() const { return cMixtureAveraged; }
 
     //! Viscosity of the mixture
     /*!
diff --git a/Cantera/src/transport/MultiTransport.h b/Cantera/src/transport/MultiTransport.h
index f362ac253..5979b8ce9 100755
--- a/Cantera/src/transport/MultiTransport.h
+++ b/Cantera/src/transport/MultiTransport.h
@@ -85,7 +85,7 @@ namespace Cantera {
     virtual ~MultiTransport();
 
     // overloaded base class methods
-    virtual int model() {
+    virtual int model() const {
       if (m_mode == CK_Mode)
 	return CK_Multicomponent;
       else
diff --git a/Cantera/src/transport/SolidTransport.h b/Cantera/src/transport/SolidTransport.h
index 027ba9816..76e18f943 100644
--- a/Cantera/src/transport/SolidTransport.h
+++ b/Cantera/src/transport/SolidTransport.h
@@ -46,7 +46,7 @@ namespace Cantera {
     public:
 virtual ~SolidTransport() {}
 
-        virtual int model() { return cSolidTransport; }
+        virtual int model() const { return cSolidTransport; }
 
         virtual doublereal thermalConductivity();
         virtual void getMixDiffCoeffs(doublereal* const d);
diff --git a/Cantera/src/transport/TransportBase.cpp b/Cantera/src/transport/TransportBase.cpp
index 532530690..75da215b7 100644
--- a/Cantera/src/transport/TransportBase.cpp
+++ b/Cantera/src/transport/TransportBase.cpp
@@ -9,10 +9,12 @@
 
 #include "ThermoPhase.h"
 #include "LiquidTransport.h"
+#include "ctexceptions.h"
 
 #include "utilities.h"
 #include "LiquidTransportParams.h"
 #include "TransportFactory.h"
+#include "stringUtils.h"
 
 #include "ctlapack.h"
 
@@ -31,8 +33,6 @@ namespace Cantera {
   //////////////////// class LiquidTransport methods //////////////
 
 
-
-
   Transport::Transport(thermo_t* thermo, int ndim) :
     m_thermo(thermo),
     m_ready(false),
@@ -109,5 +109,37 @@ namespace Cantera {
   {
     err("setParameters"); 
   }
+
+
+  void Transport::setThermo(thermo_t& thermo) { 
+    if (!ready()) { 
+      m_thermo = &thermo;
+      m_nmin = m_thermo->nSpecies();
+    }
+    else 
+      throw CanteraError("Transport::setThermo",
+			 "the phase object cannot be changed after "
+			 "the transport manager has been constructed.");
+  }
+
+
+  doublereal Transport::err(std::string msg) const {
+
+    throw CanteraError("Transport Base Class",
+		       "\n\n\n**** Method "+ msg +" not implemented in model "
+		       + int2str(model()) + " ****\n"
+		       "(Did you forget to specify a transport model?)\n\n\n");
+   	 
+    return 0.0;
+  }
+
   
+  void Transport::finalize() {
+    if (!ready()) 
+      m_ready = true;
+    else 
+      throw CanteraError("Transport::finalize",
+			 "finalize has already been called.");
+  }
+
 }
diff --git a/Cantera/src/transport/TransportBase.h b/Cantera/src/transport/TransportBase.h
index 777cc8315..dd0d7aae3 100755
--- a/Cantera/src/transport/TransportBase.h
+++ b/Cantera/src/transport/TransportBase.h
@@ -109,7 +109,7 @@ namespace Cantera {
      * virtual method returns an integer flag that identifies the
      * transport model implemented. The base class returns 0.
      */
-    virtual int model() {return 0;}
+    virtual int model() const {return 0;}
 
     /**
      * Phase object. Every transport manager is designed to compute
diff --git a/Cantera/src/transport/TransportFactory.cpp b/Cantera/src/transport/TransportFactory.cpp
index aa7490c2b..2beffa8e9 100755
--- a/Cantera/src/transport/TransportFactory.cpp
+++ b/Cantera/src/transport/TransportFactory.cpp
@@ -95,31 +95,6 @@ namespace Cantera {
 #endif
   };
 
-  //////////////////// class Transport methods /////////////////////
-
-  void Transport::setThermo(thermo_t& thermo) { 
-    if (!ready()) { 
-      m_thermo = &thermo;
-      m_nmin = m_thermo->nSpecies();
-    }
-    else 
-      throw CanteraError("Transport::setThermo",
-			 "the phase object cannot be changed after "
-			 "the transport manager has been constructed.");
-  }
-
-  void Transport::finalize() {
-    if (!ready()) 
-      m_ready = true;
-    else 
-      throw CanteraError("Transport::finalize",
-			 "finalize has already been called.");
-  }
-
-  doublereal Transport::err(string msg) const { 
-    throw NotImplemented(msg);
-    //return 0.0;
-  }
 
   //////////////////// class TransportFactory methods //////////////
 
diff --git a/Cantera/src/transport/WaterTransport.h b/Cantera/src/transport/WaterTransport.h
index 6e3b10b4a..31d89966a 100644
--- a/Cantera/src/transport/WaterTransport.h
+++ b/Cantera/src/transport/WaterTransport.h
@@ -81,7 +81,7 @@ namespace Cantera {
     virtual ~WaterTransport();
 
     //! Return the model id for this transport parameterization
-    virtual int model() {
+    virtual int model() const {
       return cWaterTransport; 
     }