diff --git a/CMakeLists_files.cmake b/CMakeLists_files.cmake
index af9783ff1..f2e0c9fc7 100644
--- a/CMakeLists_files.cmake
+++ b/CMakeLists_files.cmake
@@ -41,6 +41,7 @@ list (APPEND MAIN_SOURCE_FILES
   opm/core/props/satfunc/RelpermDiagnostics.cpp
   opm/simulators/timestepping/SimulatorReport.cpp
   opm/simulators/flow/countGlobalCells.cpp
+  opm/simulators/flow/ConvergenceOutputConfiguration.cpp
   opm/simulators/flow/KeywordValidation.cpp
   opm/simulators/flow/SimulatorFullyImplicitBlackoilEbos.cpp
   opm/simulators/flow/ValidationFunctions.cpp
@@ -171,6 +172,7 @@ endif()
 list (APPEND TEST_SOURCE_FILES
   tests/test_ALQState.cpp
   tests/test_blackoil_amg.cpp
+  tests/test_convergenceoutputconfiguration.cpp
   tests/test_convergencereport.cpp
   tests/test_deferredlogger.cpp
   tests/test_eclinterregflows.cpp
@@ -271,6 +273,7 @@ list (APPEND PUBLIC_HEADER_FILES
   opm/simulators/flow/countGlobalCells.hpp
   opm/simulators/flow/BlackoilModelEbos.hpp
   opm/simulators/flow/BlackoilModelParametersEbos.hpp
+  opm/simulators/flow/ConvergenceOutputConfiguration.hpp
   opm/simulators/flow/FlowMainEbos.hpp
   opm/simulators/flow/Main.hpp
   opm/simulators/flow/NonlinearSolverEbos.hpp
diff --git a/opm/simulators/flow/ConvergenceOutputConfiguration.cpp b/opm/simulators/flow/ConvergenceOutputConfiguration.cpp
new file mode 100644
index 000000000..384752a66
--- /dev/null
+++ b/opm/simulators/flow/ConvergenceOutputConfiguration.cpp
@@ -0,0 +1,128 @@
+/*
+  Copyright 2022 Equinor ASA.
+
+  This file is part of the Open Porous Media project (OPM).
+
+  OPM 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.
+
+  OPM 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 OPM.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <opm/simulators/flow/ConvergenceOutputConfiguration.hpp>
+
+#include <algorithm>
+#include <cstddef>
+#include <regex>
+#include <stdexcept>
+#include <string_view>
+#include <string>
+#include <unordered_map>
+#include <utility>
+#include <vector>
+
+#include <fmt/format.h>
+
+namespace {
+    std::vector<std::string> tokenizeOptionValues(std::string_view options)
+    {
+        const auto split = std::regex { R"(\s*,\s*)" };
+        return {
+            std::cregex_token_iterator {
+                options.begin(), options.end(), split, -1
+            },
+            std::cregex_token_iterator {}
+        };
+    }
+
+    void reportUnsupportedOptionValuesAndThrow(std::vector<std::string> unsupp,
+                                               std::string_view         optionName)
+    {
+        std::sort(unsupp.begin(), unsupp.end());
+        auto u = std::unique(unsupp.begin(), unsupp.end());
+
+        const auto pl = (std::distance(unsupp.begin(), u) != 1) ? "s" : "";
+
+        if (optionName.empty()) {
+            throw std::invalid_argument {
+                fmt::format("Unsupported convergence output "
+                            "option value{}: {}\n"
+                            "Supported values are \"none\", "
+                            "\"steps\", and \"iterations\"",
+                            pl, fmt::join(unsupp.begin(), u, ", "))
+            };
+        }
+
+        throw std::invalid_argument {
+            fmt::format("Option {}:\n - Unsupported value{}: {}\n"
+                        " - Supported values are \"none\", "
+                        "\"steps\", and \"iterations\"",
+                        optionName, pl,
+                        fmt::join(unsupp.begin(), u, ", "))
+        };
+    }
+
+    std::vector<Opm::ConvergenceOutputConfiguration::Option>
+    getOptions(std::string_view options, std::string_view optionName)
+    {
+        using Option = Opm::ConvergenceOutputConfiguration::Option;
+
+        auto opt = std::vector<Option>{};
+
+        const auto values = std::unordered_map<std::string, Option> {
+            { "none"      , Option::None       },
+            { "step"      , Option::Steps      }, // Alias for 'steps' (plural)
+            { "steps"     , Option::Steps      },
+            { "iteration" , Option::Iterations }, // Alias for 'iterations' (plural)
+            { "iterations", Option::Iterations },
+        };
+
+        auto unsupp = std::vector<std::string>{};
+        for (const auto& value : tokenizeOptionValues(options)) {
+            if (auto option = values.find(value); option != values.end()) {
+                opt.push_back(option->second);
+            }
+            else {
+                unsupp.push_back(value);
+            }
+        }
+
+        if (! unsupp.empty()) {
+            reportUnsupportedOptionValuesAndThrow(std::move(unsupp), optionName);
+        }
+
+        return opt;
+    }
+} // Anonymous namespace
+
+// ===========================================================================
+// Public Interface Below Separator
+// ===========================================================================
+
+Opm::ConvergenceOutputConfiguration::
+ConvergenceOutputConfiguration(std::string_view options,
+                               std::string_view optionName)
+{
+    auto is_none = false;
+    for (const auto& option : getOptions(options, optionName)) {
+        if (option == Option::None) {
+            is_none = true;
+            break;
+        }
+
+        this->flag_ |= static_cast<std::byte>(option);
+    }
+
+    if (is_none) {
+        // Recall: "none" overrides all other options.
+        this->flag_ = std::byte{0};
+    }
+}
diff --git a/opm/simulators/flow/ConvergenceOutputConfiguration.hpp b/opm/simulators/flow/ConvergenceOutputConfiguration.hpp
new file mode 100644
index 000000000..78f30bd7a
--- /dev/null
+++ b/opm/simulators/flow/ConvergenceOutputConfiguration.hpp
@@ -0,0 +1,93 @@
+/*
+  Copyright 2022 Equinor ASA.
+
+  This file is part of the Open Porous Media project (OPM).
+
+  OPM 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.
+
+  OPM 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 OPM.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef CONVERGENCE_OUTPUT_CONFIGURATION_HPP
+#define CONVERGENCE_OUTPUT_CONFIGURATION_HPP
+
+#include <cstddef>
+#include <string_view>
+
+namespace Opm {
+
+/// Parse comma separated option strings into a runtime configuration object
+/// for whether to output additional convergence information and, if so,
+/// what information to output.
+///
+/// Supported option string values are
+///
+///   * "none"       -- Dont want any additional convergence output.
+///
+///   * "steps"      -- Want additional convergence output pertaining to the
+///                     converged solution at the end of each timestep.
+///
+///   * "iterations" -- Want additional convergence output pertaining to each
+///                     non-linar ieration in each timestep.
+///
+/// Option value "none" overrides all other options.  In other words, if the
+/// user requests "none", then there will be no additional convergence
+/// output, even if there are other options in the option string.
+class ConvergenceOutputConfiguration
+{
+public:
+    /// Option values.
+    ///
+    /// None overrides all other options.  In other words, if the user
+    /// requests None, then there will be no additional convergence output,
+    /// even if there are other options in the option string.
+    enum class Option : unsigned char {
+        None = 0,
+        Steps = 1 << 1,
+        Iterations = 1 << 2,
+    };
+
+    /// Constructor
+    ///
+    /// Parses comma separated option string into runtime configuration
+    /// option.
+    ///
+    /// \param[in] options Comma separated option string.
+    ///
+    /// \param[in] optionName Name of command line option whose value is \p
+    ///    options.  Used as diagnostic information only, and only if
+    ///    specified.
+    explicit ConvergenceOutputConfiguration(std::string_view options,
+                                            std::string_view optionName = "");
+
+    /// Whether or not user wants any additional convergence output at all.
+    bool any() const
+    {
+        return this->flag_ != std::byte{0};
+    }
+
+    /// Whether or not user wants specific convergence output.
+    ///
+    /// \param[in] opt Specific convergence output type.
+    bool want(const Option opt) const
+    {
+        return std::to_integer<int>(this->flag_ & static_cast<std::byte>(opt)) != 0;
+    }
+
+private:
+    /// Option flags.  Treated as a small bitset.
+    std::byte flag_{0};
+};
+
+} // namespace Opm
+
+#endif // CONVERGENCE_OUTPUT_CONFIGURATION_HPP
diff --git a/opm/simulators/flow/FlowMainEbos.hpp b/opm/simulators/flow/FlowMainEbos.hpp
index 484e03ef7..dbdaa8a4c 100644
--- a/opm/simulators/flow/FlowMainEbos.hpp
+++ b/opm/simulators/flow/FlowMainEbos.hpp
@@ -25,6 +25,7 @@
 
 #include <sys/utsname.h>
 
+#include <opm/simulators/flow/ConvergenceOutputConfiguration.hpp>
 #include <opm/simulators/flow/SimulatorFullyImplicitBlackoilEbos.hpp>
 #include <opm/simulators/utils/ParallelFileMerger.hpp>
 #include <opm/simulators/utils/moduleVersion.hpp>
@@ -574,27 +575,37 @@ namespace Opm
         // Output summary after simulation has completed
         void runSimulatorAfterSim_(SimulatorReport &report)
         {
-            if (this->output_cout_) {
-                std::ostringstream ss;
-                ss << "\n\n================    End of simulation     ===============\n\n";
-                ss << fmt::format("Number of MPI processes: {:9}\n", mpi_size_ );
-#if _OPENMP
-                int threads = omp_get_max_threads();
+            if (! this->output_cout_) {
+                return;
+            }
+
+            const int threads
+#if !defined(_OPENMP) || !_OPENMP
+                = 1;
 #else
-                int threads = 1;
+                = omp_get_max_threads();
 #endif
-                ss << fmt::format("Threads per MPI process: {:9}\n", threads);
-                report.reportFullyImplicit(ss);
-                OpmLog::info(ss.str());
-                const std::string dir = eclState().getIOConfig().getOutputDir();
+
+            std::ostringstream ss;
+            ss << "\n\n================    End of simulation     ===============\n\n";
+            ss << fmt::format("Number of MPI processes: {:9}\n", mpi_size_ );
+            ss << fmt::format("Threads per MPI process: {:9}\n", threads);
+            report.reportFullyImplicit(ss);
+            OpmLog::info(ss.str());
+
+            const auto extraConvOutput = ConvergenceOutputConfiguration {
+                EWOMS_GET_PARAM(TypeTag, std::string, ExtraConvergenceOutput),
+                R"(ExtraConvergenceOutput (--extra-convergence-output))"
+            };
+
+            if (extraConvOutput.want(ConvergenceOutputConfiguration::Option::Steps)) {
                 namespace fs = ::std::filesystem;
-                fs::path output_dir(dir);
-                {
-                    std::string filename = eclState().getIOConfig().getBaseName() + ".INFOSTEP";
-                    fs::path fullpath = output_dir / filename;
-                    std::ofstream os(fullpath.string());
-                    report.fullReports(os);
-                }
+
+                const auto infostep = fs::path { eclState().getIOConfig().getOutputDir() } /
+                    fs::path { eclState().getIOConfig().getBaseName() }.concat(".INFOSTEP");
+
+                std::ofstream os(infostep);
+                report.fullReports(os);
             }
         }
 
diff --git a/opm/simulators/flow/SimulatorFullyImplicitBlackoilEbos.hpp b/opm/simulators/flow/SimulatorFullyImplicitBlackoilEbos.hpp
index b4922883d..83cdb890c 100644
--- a/opm/simulators/flow/SimulatorFullyImplicitBlackoilEbos.hpp
+++ b/opm/simulators/flow/SimulatorFullyImplicitBlackoilEbos.hpp
@@ -44,6 +44,12 @@ struct EnableTuning {
     using type = UndefinedProperty;
 };
 
+template <class TypeTag, class MyTypeTag>
+struct ExtraConvergenceOutput
+{
+    using type = UndefinedProperty;
+};
+
 template<class TypeTag>
 struct EnableTerminalOutput<TypeTag, TTag::EclFlowProblem> {
     static constexpr bool value = true;
@@ -57,6 +63,12 @@ struct EnableTuning<TypeTag, TTag::EclFlowProblem> {
     static constexpr bool value = false;
 };
 
+template <class TypeTag>
+struct ExtraConvergenceOutput<TypeTag, TTag::EclFlowProblem>
+{
+    static constexpr auto* value = "none";
+};
+
 } // namespace Opm::Properties
 
 namespace Opm {
@@ -137,6 +149,15 @@ public:
                              "Use adaptive time stepping between report steps");
         EWOMS_REGISTER_PARAM(TypeTag, bool, EnableTuning,
                              "Honor some aspects of the TUNING keyword.");
+        EWOMS_REGISTER_PARAM(TypeTag, std::string, ExtraConvergenceOutput,
+                             "Provide additional convergence output "
+                             "files for diagnostic purposes. "
+                             "\"none\" gives no extra output and "
+                             "overrides all other options, "
+                             "\"steps\" generates an INFOSTEP file, "
+                             "\"iterations\" generates an INFOITER file. "
+                             "Combine options with commas, e.g., "
+                             "\"steps,iterations\" for multiple outputs.");
     }
 
     /// Run the simulation.
diff --git a/tests/test_convergenceoutputconfiguration.cpp b/tests/test_convergenceoutputconfiguration.cpp
new file mode 100644
index 000000000..5e83a4de8
--- /dev/null
+++ b/tests/test_convergenceoutputconfiguration.cpp
@@ -0,0 +1,160 @@
+/*
+  Copyright 2022 Equinor.
+
+  This file is part of the Open Porous Media project (OPM).
+
+  OPM 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.
+
+  OPM 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 OPM.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <config.h>
+
+#define BOOST_TEST_MODULE TestConvergenceOutputConfiguration
+
+#include <boost/test/unit_test.hpp>
+
+#include <opm/simulators/flow/ConvergenceOutputConfiguration.hpp>
+
+#include <cstddef>
+#include <stdexcept>
+#include <string_view>
+#include <string>
+
+BOOST_AUTO_TEST_SUITE(Common_Operations)
+
+BOOST_AUTO_TEST_CASE(None)
+{
+    const auto config = Opm::ConvergenceOutputConfiguration{"none"};
+    BOOST_CHECK_MESSAGE(! config.any(),
+                        "Configuration object with option value "
+                        "\"none\" must NOT activate output");
+}
+
+BOOST_AUTO_TEST_CASE(Steps)
+{
+    const auto config = Opm::ConvergenceOutputConfiguration{"steps"};
+    BOOST_CHECK_MESSAGE(config.any(),
+                        "Configuration object with supported "
+                        "option value must activate option");
+    BOOST_CHECK_MESSAGE(config.want(Opm::ConvergenceOutputConfiguration::Option::Steps),
+                        "Configuration object with \"steps\" "
+                        "option value must activate Steps option");
+}
+
+BOOST_AUTO_TEST_CASE(Steps_Alias)
+{
+    const auto config = Opm::ConvergenceOutputConfiguration{"step"};
+    BOOST_CHECK_MESSAGE(config.any(),
+                        "Configuration object with supported "
+                        "option value must activate option");
+    BOOST_CHECK_MESSAGE(config.want(Opm::ConvergenceOutputConfiguration::Option::Steps),
+                        "Configuration object with \"step\" "
+                        "option value must activate Steps option");
+}
+
+BOOST_AUTO_TEST_CASE(Iterations)
+{
+    const auto config = Opm::ConvergenceOutputConfiguration{"iterations"};
+    BOOST_CHECK_MESSAGE(config.any(),
+                        "Configuration object with supported "
+                        "option value must activate option");
+    BOOST_CHECK_MESSAGE(config.want(Opm::ConvergenceOutputConfiguration::Option::Iterations),
+                        "Configuration object with \"iterations\" "
+                        "option value must activate Steps option");
+}
+
+BOOST_AUTO_TEST_CASE(Iterations_Alias)
+{
+    const auto config = Opm::ConvergenceOutputConfiguration{"iteration"};
+    BOOST_CHECK_MESSAGE(config.any(),
+                        "Configuration object with supported "
+                        "option value must activate option");
+    BOOST_CHECK_MESSAGE(config.want(Opm::ConvergenceOutputConfiguration::Option::Iterations),
+                        "Configuration object with \"iterations\" "
+                        "option value must activate Steps option");
+}
+
+BOOST_AUTO_TEST_CASE(Combinations)
+{
+    const auto steps_iter = Opm::ConvergenceOutputConfiguration{"steps,iterations"};
+    BOOST_CHECK_MESSAGE(steps_iter.any(),
+                        "Configuration object with supported "
+                        "option value must activate option");
+    BOOST_CHECK_MESSAGE(steps_iter.want(Opm::ConvergenceOutputConfiguration::Option::Steps),
+                        "Configuration object with \"steps\" "
+                        "option value must activate Steps option");
+    BOOST_CHECK_MESSAGE(steps_iter.want(Opm::ConvergenceOutputConfiguration::Option::Iterations),
+                        "Configuration object with \"iterations\" "
+                        "option value must activate Steps option");
+
+    const auto iter_steps = Opm::ConvergenceOutputConfiguration{"iterations,steps"};
+    BOOST_CHECK_MESSAGE(iter_steps.any(),
+                        "Configuration object with supported "
+                        "option value must activate option");
+    BOOST_CHECK_MESSAGE(iter_steps.want(Opm::ConvergenceOutputConfiguration::Option::Steps),
+                        "Configuration object with \"steps\" "
+                        "option value must activate Steps option");
+    BOOST_CHECK_MESSAGE(iter_steps.want(Opm::ConvergenceOutputConfiguration::Option::Iterations),
+                        "Configuration object with \"iterations\" "
+                        "option value must activate Steps option");
+
+    const auto none_iter_steps = Opm::ConvergenceOutputConfiguration{"none,iterations,steps"};
+    BOOST_CHECK_MESSAGE(! none_iter_steps.any(),
+                        "Configuration object with any option "
+                        "value \"none\" must NOT activate output");
+
+    const auto iter_none_steps = Opm::ConvergenceOutputConfiguration{"iterations,none,steps"};
+    BOOST_CHECK_MESSAGE(! iter_none_steps.any(),
+                        "Configuration object with any option "
+                        "value \"none\" must NOT activate output");
+
+    const auto steps_iter_none = Opm::ConvergenceOutputConfiguration{"steps,iterations,   none"};
+    BOOST_CHECK_MESSAGE(! steps_iter_none.any(),
+                        "Configuration object with any option "
+                        "value \"none\" must NOT activate output");
+}
+
+BOOST_AUTO_TEST_SUITE_END() // Common_Operations
+
+// ---------------------------------------------------------------------------
+
+BOOST_AUTO_TEST_SUITE(Failed_Construction)
+
+BOOST_AUTO_TEST_CASE(Misprint)
+{
+    BOOST_CHECK_THROW(Opm::ConvergenceOutputConfiguration{"nonce"},
+                      std::invalid_argument);
+
+    BOOST_CHECK_THROW(Opm::ConvergenceOutputConfiguration{"stepS"},
+                      std::invalid_argument);
+
+    BOOST_CHECK_THROW(Opm::ConvergenceOutputConfiguration{"steps, iter"},
+                      std::invalid_argument);
+
+    BOOST_CHECK_THROW(Opm::ConvergenceOutputConfiguration{"steps, iterations, non"},
+                      std::invalid_argument);
+}
+
+BOOST_AUTO_TEST_CASE(Unknown)
+{
+    BOOST_CHECK_THROW(Opm::ConvergenceOutputConfiguration{"Hello"},
+                      std::invalid_argument);
+    BOOST_CHECK_THROW(Opm::ConvergenceOutputConfiguration{"meow"},
+                      std::invalid_argument);
+    BOOST_CHECK_THROW(Opm::ConvergenceOutputConfiguration{""},
+                      std::invalid_argument);
+    BOOST_CHECK_THROW(Opm::ConvergenceOutputConfiguration{"xyz,zy;;;"},
+                      std::invalid_argument);
+}
+
+BOOST_AUTO_TEST_SUITE_END()