diff --git a/owlps-positioning/src/input.cc b/owlps-positioning/src/input.cc
index c72a236..de6fbad 100644
--- a/owlps-positioning/src/input.cc
+++ b/owlps-positioning/src/input.cc
@@ -41,7 +41,8 @@ Input::~Input()
 void Input::initialise_input_medium()
 {
   if (! Configuration::is_configured("input.medium"))
-    throw no_input_medium() ;
+    throw missing_configuration(
+      "No input medium specified in configuration!") ;
 
   const string &medium_name =
     Configuration::string_value("input.medium") ;
@@ -49,13 +50,15 @@ void Input::initialise_input_medium()
   if (medium_name == "CSV")
     {
       if (! Configuration::is_configured("input.csv-file"))
-        throw no_input_csv_file() ;
+        throw missing_configuration(
+          "No input CSV file specified in the configuration!") ;
       medium = new
       InputCSV(Configuration::string_value("input.csv-file")) ;
     }
 
   else
-    throw input_medium_type_unknown(medium_name) ;
+    throw bad_configuration(
+      "The specified input medium « "+ medium_name +" » is unknown!") ;
 }
 
 
@@ -77,7 +80,9 @@ void Input::initialise_log_media()
         initialise_log_csv() ;
 
       else
-        throw input_medium_type_unknown(*i) ;
+        throw bad_configuration(
+          "The input medium « "+ *i +
+          " » specified for request logging is unknown!") ;
     }
 }
 
@@ -85,7 +90,8 @@ void Input::initialise_log_media()
 void Input::initialise_log_csv()
 {
   if (! Configuration::is_configured("log.csv-file"))
-    throw no_log_csv_file() ;
+    throw missing_configuration(
+      "No log CSV file specified in the configuration!") ;
 
   log_media.push_back(
     new InputLogCSV(
diff --git a/owlps-positioning/src/inputdatareader.cc b/owlps-positioning/src/inputdatareader.cc
index 66d8ac3..3944a48 100644
--- a/owlps-positioning/src/inputdatareader.cc
+++ b/owlps-positioning/src/inputdatareader.cc
@@ -35,7 +35,9 @@ void InputDataReader::initialise_topology_media()
         initialise_topology_csv() ;
 
       else
-        throw topology_input_medium_type_unknown(*i) ;
+        throw bad_configuration(
+          "The specified topology input medium « "+ *i +
+          " » is unknown!") ;
     }
 }
 
@@ -43,10 +45,12 @@ void InputDataReader::initialise_topology_media()
 void InputDataReader::initialise_topology_csv()
 {
   if (! Configuration::is_configured("data-input.areas-csv-file"))
-    throw no_topology_input_csv_file("areas") ;
+    throw missing_configuration(
+      "No topology input CSV file specified for areas") ;
 
   if (! Configuration::is_configured("data-input.waypoints-csv-file"))
-    throw no_topology_input_csv_file("waypoints") ;
+    throw missing_configuration(
+      "No topology input CSV file specified for waypoints") ;
 
   TopologyReaderCSV(
     Configuration::string_value("data-input.areas-csv-file"),
diff --git a/owlps-positioning/src/output.cc b/owlps-positioning/src/output.cc
index b69a22a..ab1743c 100644
--- a/owlps-positioning/src/output.cc
+++ b/owlps-positioning/src/output.cc
@@ -54,7 +54,8 @@ void Output::initialise_output_media()
         initialise_output_csv() ;
 
       else
-        throw output_medium_type_unknown(*i) ;
+        throw bad_configuration(
+          "The specified output medium « "+ *i +" » is unknown!") ;
     }
 }
 
@@ -68,7 +69,8 @@ void Output::initialise_output_terminal()
 void Output::initialise_output_csv()
 {
   if (! Configuration::is_configured("output.csv-file"))
-    throw no_output_csv_file() ;
+    throw missing_configuration(
+      "No output CSV file specified in the configuration!") ;
 
   output_media.push_back(
     new OutputCSV(
diff --git a/owlps-positioning/src/posexcept.cc b/owlps-positioning/src/posexcept.cc
index e107c3c..0bfdc78 100644
--- a/owlps-positioning/src/posexcept.cc
+++ b/owlps-positioning/src/posexcept.cc
@@ -6,7 +6,35 @@ using namespace std ;
 
 
 
-/* *** Other exceptions *** */
+/* *** Miscellaneous exceptions *** */
+
+
+element_not_found::
+element_not_found(const string &_explanation) throw():
+  posexcept("Element not found in collection: " + _explanation) {}
+
+
+
+/* *** Configuration *** */
+
+
+missing_configuration::
+missing_configuration(const string &_explanation) throw():
+  posexcept(_explanation) {}
+
+
+bad_configuration::
+bad_configuration(const string &_explanation) throw():
+  posexcept(_explanation) {}
+
+
+
+/* *** Input *** */
+
+
+malformed_topology::
+malformed_topology(const string &_explanation) throw():
+  posexcept("Error reading the topology: " + _explanation) {}
 
 
 bad_direction::bad_direction(const char direction) throw()
@@ -18,60 +46,15 @@ bad_direction::bad_direction(const char direction) throw()
 }
 
 
-element_not_found::
-element_not_found(const string &_explanation) throw():
-  posexcept("Element not found in collection:" + _explanation) {}
-
-
-
-/* *** Data input *** */
-
-
-topology_input_medium_type_unknown::
-topology_input_medium_type_unknown(const string &medium_name) throw():
-  posexcept("The specified topology input medium « "+ medium_name +
-            " » is unknown!") {}
-
-
-no_topology_input_csv_file::
-no_topology_input_csv_file(const string &type) throw():
-  posexcept(
-    "No topology input CSV file specified in the configuration for "
-    + type + "!") {}
-
-
-malformed_topology::
-malformed_topology(const string &_explanation) throw():
-  posexcept("Error reading the topology:" + _explanation) {}
-
-
-
-/* *** Input *** */
-
-
 /**
  * @param medium_name The medium that is unknown
  */
-input_medium_type_unknown::
-input_medium_type_unknown(const string &medium_name) throw():
-  posexcept("The specified input medium « "+ medium_name +
-            " » is unknown!") {}
-
-
-no_input_medium::no_input_medium() throw():
-  posexcept("No input medium specified in configuration!") {}
-
-
 null_input_medium::null_input_medium() throw():
   posexcept("The input medium is not initialised!") {}
 
 
-no_input_csv_file::no_input_csv_file() throw():
-  posexcept("No input CSV file specified in the configuration!") {}
 
-
-no_log_csv_file::no_log_csv_file() throw():
-  posexcept("No log CSV file specified in the configuration!") {}
+/* *** Files *** */
 
 
 error_opening_input_file::
@@ -79,40 +62,6 @@ error_opening_input_file(const string &file_name) throw():
   posexcept("Error opening input file « " + file_name + " »!") {}
 
 
-
-/* *** Output *** */
-
-
-/**
- * @param medium_name The medium that is unknown
- */
-output_medium_type_unknown::
-output_medium_type_unknown(const string &medium_name) throw():
-  posexcept("The specified output medium « "+ medium_name +
-            " » is unknown!") {}
-
-
-no_output_csv_file::no_output_csv_file() throw():
-  posexcept("No output CSV file specified in the configuration!") {}
-
-
 error_opening_output_file::
 error_opening_output_file(const string &file_name) throw():
   posexcept("Error opening output file « " + file_name + " »!") {}
-
-
-
-/* *** Algorithms *** */
-
-
-no_positioning_algorithm::no_positioning_algorithm() throw():
-  posexcept("No positioning algorithm specified in configuration!") {}
-
-
-/**
- * @param algo_name The algo that is unknown
- */
-positioning_algorithm_unknown::
-positioning_algorithm_unknown(const string &algo_name) throw():
-  posexcept("The specified positioning_algorithm « "+ algo_name +
-            " » is unknown!") {}
diff --git a/owlps-positioning/src/posexcept.hh b/owlps-positioning/src/posexcept.hh
index 072baca..7dc5672 100644
--- a/owlps-positioning/src/posexcept.hh
+++ b/owlps-positioning/src/posexcept.hh
@@ -26,14 +26,7 @@ public:
 
 
 
-/* *** Other exceptions *** */
-
-
-class bad_direction: public posexcept
-{
-public:
-  bad_direction(const char direction) throw() ;
-} ;
+/* *** Miscellaneous exceptions *** */
 
 
 class element_not_found: public posexcept
@@ -44,24 +37,27 @@ public:
 
 
 
-/* *** Data input *** */
+/* *** Configuration *** */
 
 
-class topology_input_medium_type_unknown: public posexcept
+class missing_configuration: public posexcept
 {
 public:
-  topology_input_medium_type_unknown(
-    const std::string &medium_name) throw() ;
+  missing_configuration(const std::string &_explanation) throw() ;
 } ;
 
 
-class no_topology_input_csv_file: public posexcept
+class bad_configuration: public posexcept
 {
 public:
-  no_topology_input_csv_file(const std::string &type) throw() ;
+  bad_configuration(const std::string &_explanation) throw() ;
 } ;
 
 
+
+/* *** Input *** */
+
+
 class malformed_topology: public posexcept
 {
 public:
@@ -69,21 +65,10 @@ public:
 } ;
 
 
-
-/* *** Input *** */
-
-
-class input_medium_type_unknown: public posexcept
+class bad_direction: public posexcept
 {
 public:
-  input_medium_type_unknown(const std::string &medium_name) throw() ;
-} ;
-
-
-class no_input_medium: public posexcept
-{
-public:
-  no_input_medium(void) throw() ;
+  bad_direction(const char direction) throw() ;
 } ;
 
 
@@ -94,18 +79,8 @@ public:
 } ;
 
 
-class no_input_csv_file: public posexcept
-{
-public:
-  no_input_csv_file(void) throw() ;
-} ;
 
-
-class no_log_csv_file: public posexcept
-{
-public:
-  no_log_csv_file(void) throw() ;
-} ;
+/* *** Files *** */
 
 
 class error_opening_input_file: public posexcept
@@ -115,24 +90,6 @@ public:
 } ;
 
 
-
-/* *** Output *** */
-
-
-class output_medium_type_unknown: public posexcept
-{
-public:
-  output_medium_type_unknown(const std::string &medium_name) throw() ;
-} ;
-
-
-class no_output_csv_file: public posexcept
-{
-public:
-  no_output_csv_file(void) throw() ;
-} ;
-
-
 class error_opening_output_file: public posexcept
 {
 public:
@@ -141,22 +98,4 @@ public:
 
 
 
-/* *** Algorithms *** */
-
-
-class no_positioning_algorithm: public posexcept
-{
-public:
-  no_positioning_algorithm(void) throw() ;
-} ;
-
-
-class positioning_algorithm_unknown: public posexcept
-{
-public:
-  positioning_algorithm_unknown(const std::string &algo_name) throw() ;
-} ;
-
-
-
 #endif // _OWLPS_POSITIONING_POSEXCEPT_HH_
diff --git a/owlps-positioning/src/positioning.cc b/owlps-positioning/src/positioning.cc
index e3779f4..16f43ec 100644
--- a/owlps-positioning/src/positioning.cc
+++ b/owlps-positioning/src/positioning.cc
@@ -34,7 +34,8 @@ Positioning::~Positioning()
 void Positioning::initialise_algorithms()
 {
   if (! Configuration::is_configured("positioning.algorithm"))
-    throw no_positioning_algorithm() ;
+    throw missing_configuration(
+      "No positioning algorithm specified in configuration!") ;
 
   const vector<string> &algo_names =
     Configuration::string_vector_value("positioning.algorithm") ;
@@ -49,7 +50,9 @@ void Positioning::initialise_algorithms()
         algorithms.push_back(new InterlinkNetworks) ;
 
       else
-        throw positioning_algorithm_unknown(*i) ;
+        throw bad_configuration(
+          "The specified positioning_algorithm « "+ *i +
+          " » is unknown!") ;
     }
 }
 
diff --git a/owlps-positioning/tests/input_test.hh b/owlps-positioning/tests/input_test.hh
index c361b7e..5f8b335 100644
--- a/owlps-positioning/tests/input_test.hh
+++ b/owlps-positioning/tests/input_test.hh
@@ -10,7 +10,7 @@ public:
   void test_constructor(void)
   {
     // TODO: test with a mock Configuration?
-    TS_ASSERT_THROWS(Input input1, no_input_medium) ;
+    TS_ASSERT_THROWS(Input input1, missing_configuration) ;
   }
 
 } ;