diff --git a/Documentation/ProjectFile/prj/time_loop/output/t_fixed_output_times.md b/Documentation/ProjectFile/prj/time_loop/output/t_fixed_output_times.md
new file mode 100644
index 0000000000000000000000000000000000000000..a933a2d49f7fd18cdc8564805763bdfc46c8c79d
--- /dev/null
+++ b/Documentation/ProjectFile/prj/time_loop/output/t_fixed_output_times.md
@@ -0,0 +1,2 @@
+An option input of fixed times, at which the output of the results must be
+ conducted.
diff --git a/Documentation/ProjectFile/prj/time_loop/output/t_specified_times.md b/Documentation/ProjectFile/prj/time_loop/output/t_specified_times.md
deleted file mode 100644
index be6096be2f3abb406e19592a21de79f04c65dec6..0000000000000000000000000000000000000000
--- a/Documentation/ProjectFile/prj/time_loop/output/t_specified_times.md
+++ /dev/null
@@ -1,2 +0,0 @@
-An option input of specified times, at which the output of the results must be
- conducted.
diff --git a/Documentation/ProjectFile/prj/time_loop/processes/process/time_stepping/EvolutionaryPIDcontroller/t_fixed_output_times.md b/Documentation/ProjectFile/prj/time_loop/processes/process/time_stepping/EvolutionaryPIDcontroller/t_fixed_output_times.md
new file mode 100644
index 0000000000000000000000000000000000000000..e57ef89f7f00401c2ba2a207b788757d96c9aed8
--- /dev/null
+++ b/Documentation/ProjectFile/prj/time_loop/processes/process/time_stepping/EvolutionaryPIDcontroller/t_fixed_output_times.md
@@ -0,0 +1 @@
+The fixed times that must be reached in the time stepping.
diff --git a/Documentation/ProjectFile/prj/time_loop/processes/process/time_stepping/EvolutionaryPIDcontroller/t_specified_times.md b/Documentation/ProjectFile/prj/time_loop/processes/process/time_stepping/EvolutionaryPIDcontroller/t_specified_times.md
deleted file mode 100644
index d75c95a8ae00edf5862927bff3258490df563e1c..0000000000000000000000000000000000000000
--- a/Documentation/ProjectFile/prj/time_loop/processes/process/time_stepping/EvolutionaryPIDcontroller/t_specified_times.md
+++ /dev/null
@@ -1 +0,0 @@
-The specified times that must be reached in the time stepping.
diff --git a/NumLib/TimeStepping/Algorithms/CreateEvolutionaryPIDcontroller.cpp b/NumLib/TimeStepping/Algorithms/CreateEvolutionaryPIDcontroller.cpp
index 0f3c6db518c3dc3316adf27611773d762d68bade..19837d03975bf3b2a1bfa290dd3de501068b1657 100644
--- a/NumLib/TimeStepping/Algorithms/CreateEvolutionaryPIDcontroller.cpp
+++ b/NumLib/TimeStepping/Algorithms/CreateEvolutionaryPIDcontroller.cpp
@@ -42,14 +42,14 @@ std::unique_ptr<TimeStepAlgorithm> createEvolutionaryPIDcontroller(
     //! \ogs_file_param{prj__time_loop__processes__process__time_stepping__EvolutionaryPIDcontroller__rel_dt_max}
     auto const rel_h_max = config.getConfigParameter<double>("rel_dt_max");
 
-    auto specified_times =
-        //! \ogs_file_param{prj__time_loop__processes__process__time_stepping__EvolutionaryPIDcontroller__specified_times}
-        config.getConfigParameter<std::vector<double>>("specified_times",
+    auto fixed_output_times =
+        //! \ogs_file_param{prj__time_loop__processes__process__time_stepping__EvolutionaryPIDcontroller__fixed_output_times}
+        config.getConfigParameter<std::vector<double>>("fixed_output_times",
                                                        std::vector<double>{});
-    if (!specified_times.empty())
+    if (!fixed_output_times.empty())
     {
         // Remove possible duplicated elements and sort in descending order.
-        BaseLib::makeVectorUnique(specified_times, std::greater<double>());
+        BaseLib::makeVectorUnique(fixed_output_times, std::greater<double>());
     }
 
     //! \ogs_file_param{prj__time_loop__processes__process__time_stepping__EvolutionaryPIDcontroller__tol}
@@ -57,6 +57,6 @@ std::unique_ptr<TimeStepAlgorithm> createEvolutionaryPIDcontroller(
 
     return std::make_unique<EvolutionaryPIDcontroller>(
         t0, t_end, h0, h_min, h_max, rel_h_min, rel_h_max,
-        std::move(specified_times), tol);
+        std::move(fixed_output_times), tol);
 }
 }  // end of namespace NumLib
diff --git a/NumLib/TimeStepping/Algorithms/EvolutionaryPIDcontroller.cpp b/NumLib/TimeStepping/Algorithms/EvolutionaryPIDcontroller.cpp
index bfb8240cb784f8b56e38dd10cf269fba9d7e6be0..f98d91a426b371f6d8b26374c4bb49ec168845f2 100644
--- a/NumLib/TimeStepping/Algorithms/EvolutionaryPIDcontroller.cpp
+++ b/NumLib/TimeStepping/Algorithms/EvolutionaryPIDcontroller.cpp
@@ -143,28 +143,28 @@ double EvolutionaryPIDcontroller::limitStepSize(
 
 double EvolutionaryPIDcontroller::checkSpecificTimeReached(const double h_new)
 {
-    if (_specified_times.empty())
+    if (_fixed_output_times.empty())
         return h_new;
 
-    const double specific_time = _specified_times.back();
+    const double specific_time = _fixed_output_times.back();
     if ((specific_time > _ts_current.current()) &&
         (_ts_current.current() + h_new - specific_time > 0.0))
     {
-        _specified_times.pop_back();
+        _fixed_output_times.pop_back();
         return specific_time - _ts_current.current();
     }
 
     return h_new;
 }
 
-void EvolutionaryPIDcontroller::addSpecifiedTimes(
-    std::vector<double> const& extra_specified_times)
+void EvolutionaryPIDcontroller::addFixedOutputTimes(
+    std::vector<double> const& extra_fixed_output_times)
 {
-    _specified_times.insert(_specified_times.end(), extra_specified_times.begin(),
-                           extra_specified_times.end());
+    _fixed_output_times.insert(_fixed_output_times.end(),
+                               extra_fixed_output_times.begin(),
+                               extra_fixed_output_times.end());
 
     // Remove possible duplicated elements and sort in descending order.
-    BaseLib::makeVectorUnique(_specified_times, std::greater<double>());
+    BaseLib::makeVectorUnique(_fixed_output_times, std::greater<double>());
 }
-
 }  // end of namespace NumLib
diff --git a/NumLib/TimeStepping/Algorithms/EvolutionaryPIDcontroller.h b/NumLib/TimeStepping/Algorithms/EvolutionaryPIDcontroller.h
index 9d18dfb6efcbf3e8bd61d659ed4ffc8902266360..3b308b0d2015d706f50df97276afc99afcd00052 100644
--- a/NumLib/TimeStepping/Algorithms/EvolutionaryPIDcontroller.h
+++ b/NumLib/TimeStepping/Algorithms/EvolutionaryPIDcontroller.h
@@ -55,7 +55,7 @@ public:
                               const double h0, const double h_min,
                               const double h_max, const double rel_h_min,
                               const double rel_h_max,
-                              const std::vector<double>&& specified_times,
+                              const std::vector<double>&& fixed_output_times,
                               const double tol)
         : TimeStepAlgorithm(t0, t_end),
           _h0(h0),
@@ -63,7 +63,7 @@ public:
           _h_max(h_max),
           _rel_h_min(rel_h_min),
           _rel_h_max(rel_h_max),
-          _specified_times(std::move(specified_times)),
+          _fixed_output_times(std::move(fixed_output_times)),
           _tol(tol),
           _e_n_minus1(0.),
           _e_n_minus2(0.),
@@ -92,9 +92,9 @@ public:
     /// solution error.
     bool isSolutionErrorComputationNeeded() override { return true; }
 
-    /// \copydoc NumLib::TimeStepAlgorithm::addSpecifiedTimes
-    void addSpecifiedTimes(
-        std::vector<double> const& extra_specified_times) override;
+    /// \copydoc NumLib::TimeStepAlgorithm::addFixedOutputTimes
+    void addFixedOutputTimes(
+        std::vector<double> const& extra_fixed_output_times) override;
 
 private:
     const double _kP = 0.075;  ///< Parameter. \see EvolutionaryPIDcontroller
@@ -111,7 +111,7 @@ private:
     const double _rel_h_max;
 
     // Given times that steps have to reach.
-    std::vector<double> _specified_times;
+    std::vector<double> _fixed_output_times;
 
     const double _tol;
 
diff --git a/NumLib/TimeStepping/Algorithms/TimeStepAlgorithm.h b/NumLib/TimeStepping/Algorithms/TimeStepAlgorithm.h
index 3dc899ab986ba0ebef7ca830291ea7681c2ebcba..48cd0da6212fd8912e85c19b0378dbe728caf43c 100644
--- a/NumLib/TimeStepping/Algorithms/TimeStepAlgorithm.h
+++ b/NumLib/TimeStepping/Algorithms/TimeStepAlgorithm.h
@@ -93,7 +93,8 @@ public:
      * the specified times. The function is mainly used to accept the specified
      * times from the configuration of output.
      */
-    virtual void addSpecifiedTimes(std::vector<double> const& /*specified_times*/)
+    virtual void addFixedOutputTimes(
+        std::vector<double> const& /*fixed_output_times*/)
     {
     }
 
diff --git a/ProcessLib/Output/CreateOutput.cpp b/ProcessLib/Output/CreateOutput.cpp
index 8ef7c8d88cfe5aef9875cafd2215d49db2cb0509..972f759221bd16974e27452df30b7020da70966c 100644
--- a/ProcessLib/Output/CreateOutput.cpp
+++ b/ProcessLib/Output/CreateOutput.cpp
@@ -44,7 +44,7 @@ std::unique_ptr<Output> createOutput(const BaseLib::ConfigTree& config,
     // Construction of output times
     std::vector<Output::PairRepeatEachSteps> repeats_each_steps;
 
-    std::vector<double> specified_times;
+    std::vector<double> fixed_output_times;
 
     //! \ogs_file_param{prj__time_loop__output__timesteps}
     if (auto const timesteps = config.getConfigSubtreeOptional("timesteps"))
@@ -74,15 +74,15 @@ std::unique_ptr<Output> createOutput(const BaseLib::ConfigTree& config,
         repeats_each_steps.emplace_back(1, 1);
     }
 
-    auto specified_times_ptr =
-        //! \ogs_file_param{prj__time_loop__output__specified_times}
+    auto fixed_output_times_ptr =
+        //! \ogs_file_param{prj__time_loop__output__fixed_output_times}
         config.getConfigParameterOptional<std::vector<double>>(
-            "specified_times");
-    if (specified_times_ptr)
+            "fixed_output_times");
+    if (fixed_output_times_ptr)
     {
-        specified_times = std::move(*specified_times_ptr);
+        fixed_output_times = std::move(*fixed_output_times_ptr);
         // Remove possible duplicated elements and sort in descending order.
-        BaseLib::makeVectorUnique(specified_times, std::greater<double>());
+        BaseLib::makeVectorUnique(fixed_output_times, std::greater<double>());
     }
 
     bool const output_iteration_results =
@@ -92,7 +92,7 @@ std::unique_ptr<Output> createOutput(const BaseLib::ConfigTree& config,
     return std::make_unique<Output>(output_directory, prefix, compress_output,
                                     data_mode, output_iteration_results,
                                     std::move(repeats_each_steps),
-                                    std::move(specified_times));
+                                    std::move(fixed_output_times));
 }
 
 }  // namespace ProcessLib
diff --git a/ProcessLib/Output/Output.cpp b/ProcessLib/Output/Output.cpp
index a3e8652e229142689c22ef124c96144e27130607..e62fc84c96f04ffd61f57d4babd6d2ab259db5a0 100644
--- a/ProcessLib/Output/Output.cpp
+++ b/ProcessLib/Output/Output.cpp
@@ -67,14 +67,14 @@ bool Output::shallDoOutput(unsigned timestep, double const t)
 
     bool make_output = timestep % each_steps == 0;
 
-    if (_specified_times.empty())
+    if (_fixed_output_times.empty())
         return make_output;
 
-    const double specific_time = _specified_times.back();
+    const double specific_time = _fixed_output_times.back();
     const double zero_threshold = std::numeric_limits<double>::min();
     if (std::fabs(specific_time - t) < zero_threshold)
     {
-        _specified_times.pop_back();
+        _fixed_output_times.pop_back();
         make_output = true;
     }
 
@@ -85,14 +85,14 @@ Output::Output(std::string output_directory, std::string prefix,
                bool const compress_output, std::string const& data_mode,
                bool const output_nonlinear_iteration_results,
                std::vector<PairRepeatEachSteps> repeats_each_steps,
-               std::vector<double>&& specified_times)
+               std::vector<double>&& fixed_output_times)
     : _output_directory(std::move(output_directory)),
       _output_file_prefix(std::move(prefix)),
       _output_file_compression(compress_output),
       _output_file_data_mode(convertVtkDataMode(data_mode)),
       _output_nonlinear_iteration_results(output_nonlinear_iteration_results),
       _repeats_each_steps(std::move(repeats_each_steps)),
-      _specified_times(std::move(specified_times))
+      _fixed_output_times(std::move(fixed_output_times))
 {
 }
 
diff --git a/ProcessLib/Output/Output.h b/ProcessLib/Output/Output.h
index 5f04d41f2783ee74d4e992b794e525c028483235..4200f0c6de6c1e73463ccedfd17e741951ad5ee0 100644
--- a/ProcessLib/Output/Output.h
+++ b/ProcessLib/Output/Output.h
@@ -43,7 +43,7 @@ public:
            bool const compress_output, std::string const& data_mode,
            bool const output_nonlinear_iteration_results,
            std::vector<PairRepeatEachSteps> repeats_each_steps,
-           std::vector<double>&& specified_times);
+           std::vector<double>&& fixed_output_times);
 
     //! TODO doc. Opens a PVD file for each process.
     void addProcess(ProcessLib::Process const& process, const int process_id);
@@ -78,7 +78,7 @@ public:
                                     GlobalVector const& x,
                                     const unsigned iteration);
 
-    std::vector<double> getSpecifiedTimes() {return _specified_times;}
+    std::vector<double> getFixedOutputTimes() {return _fixed_output_times;}
 
 private:
     struct ProcessData
@@ -104,7 +104,7 @@ private:
     std::vector<PairRepeatEachSteps> _repeats_each_steps;
 
     //! Given times that steps have to reach.
-    std::vector<double> _specified_times;
+    std::vector<double> _fixed_output_times;
 
     std::multimap<Process const*, ProcessData> _process_to_process_data;
 
diff --git a/ProcessLib/RichardsFlow/Tests.cmake b/ProcessLib/RichardsFlow/Tests.cmake
index 1e1906ca58fd6ef7bcdf5821a59781ed99025a01..454713a71520e94478069778109f3c54fea7ce2e 100644
--- a/ProcessLib/RichardsFlow/Tests.cmake
+++ b/ProcessLib/RichardsFlow/Tests.cmake
@@ -38,7 +38,7 @@ AddTest(
     DIFF_DATA
     ref_t_1600.000000.vtu richards_pcs_0_ts_803_t_1600.000000.vtu pressure pressure 1e-8 1e-3
 # The following three comparisons are used just to check whether the output is
-# made at the specific times of 50, 100 and 500, which are given in the project
+# made at the fixed times of 50, 100 and 500, which are given in the project
 # file of RichardsFlow_2d_small_adaptive_dt.prj
     richards_pcs_0_ts_28_spec_t_50.000000.vtu richards_pcs_0_ts_28_t_50.000000.vtu pressure pressure 1e-10 1e-10
     richards_pcs_0_ts_53_spec_t_100.000000.vtu richards_pcs_0_ts_53_t_100.000000.vtu pressure pressure 1e-10 1e-10
diff --git a/ProcessLib/UncoupledProcessesTimeLoop.cpp b/ProcessLib/UncoupledProcessesTimeLoop.cpp
index 0f114f0a9f23121957bd34f41db1dacb16a16521..488bc004eeb4668caa5afc0e1cf191f1f32223b0 100644
--- a/ProcessLib/UncoupledProcessesTimeLoop.cpp
+++ b/ProcessLib/UncoupledProcessesTimeLoop.cpp
@@ -532,12 +532,12 @@ bool UncoupledProcessesTimeLoop::loop()
                                        pcs.getMesh());
             }
 
-            // Add the specific times of output to time stepper in order that
+            // Add the fixed times of output to time stepper in order that
             // the time stepping is performed and the results are output at
             // these times. Note: only the adaptive time steppers can have the
-            // the specific times.
+            // the fixed times.
             auto& timestepper = process_data->timestepper;
-            timestepper->addSpecifiedTimes(_output->getSpecifiedTimes());
+            timestepper->addFixedOutputTimes(_output->getFixedOutputTimes());
 
             ++process_id;
         }
diff --git a/Tests/Data/Parabolic/HT/StaggeredCoupling/ConstViscosity/square_5500x5500_staggered_scheme_adaptive_dt.prj b/Tests/Data/Parabolic/HT/StaggeredCoupling/ConstViscosity/square_5500x5500_staggered_scheme_adaptive_dt.prj
index 04ed44ae095039b34df7c8833a983a58ac401ca3..d71de36f310daf5039fb1a9fe3504fdc96b34d83 100644
--- a/Tests/Data/Parabolic/HT/StaggeredCoupling/ConstViscosity/square_5500x5500_staggered_scheme_adaptive_dt.prj
+++ b/Tests/Data/Parabolic/HT/StaggeredCoupling/ConstViscosity/square_5500x5500_staggered_scheme_adaptive_dt.prj
@@ -100,7 +100,7 @@
                     <rel_dt_min> 0.1 </rel_dt_min>
                     <rel_dt_max> 10 </rel_dt_max>
                     <tol> 10.0 </tol>
-                    <specified_times>5.0e9 2.e10</specified_times>
+                    <fixed_output_times>5.0e9 2.e10</fixed_output_times>
                 </time_stepping>
             </process>
             <process ref="ConstViscosityThermalConvection">
@@ -128,7 +128,7 @@
                     <rel_dt_min> 0.1 </rel_dt_min>
                     <rel_dt_max> 10 </rel_dt_max>
                     <tol> 10.0 </tol>
-                    <specified_times>5.0e9 2.e10</specified_times>
+                    <fixed_output_times>5.0e9 2.e10</fixed_output_times>
                 </time_stepping>
             </process>
         </processes>
diff --git a/Tests/Data/Parabolic/Richards/RichardsFlow_2d_small_adaptive_dt.prj b/Tests/Data/Parabolic/Richards/RichardsFlow_2d_small_adaptive_dt.prj
index 932fce40aa55685db7b1f960e67d5e5c11effc18..3f64bd298833cfc21e442868f49c5832c49490a7 100644
--- a/Tests/Data/Parabolic/Richards/RichardsFlow_2d_small_adaptive_dt.prj
+++ b/Tests/Data/Parabolic/Richards/RichardsFlow_2d_small_adaptive_dt.prj
@@ -109,7 +109,7 @@
                     <each_steps>100000000</each_steps>
                 </pair>
             </timesteps>
-            <specified_times> 50.0 100.0 500.</specified_times>
+            <fixed_output_times> 50.0 100.0 500.</fixed_output_times>
             <output_iteration_results>false</output_iteration_results>
         </output>
     </time_loop>