diff --git a/lib/3rd_party_adapters/nlohmann/JsonGenerator.cpp b/lib/3rd_party_adapters/nlohmann/JsonGenerator.cpp
index b064ae8bc..8f3a01ce8 100644
--- a/lib/3rd_party_adapters/nlohmann/JsonGenerator.cpp
+++ b/lib/3rd_party_adapters/nlohmann/JsonGenerator.cpp
@@ -4,6 +4,7 @@
 #include <serial_protocol/ProtocolVersionObject.hpp>
 #include <serial_protocol/TaskList.hpp>
 #include <serial_protocol/TaskObject.hpp>
+#include <tasks/Task.hpp>
 
 /**
  * Indentation used by default for formating JSON.
@@ -38,10 +39,17 @@ std::string toJsonString<task_tracker_systems::TaskObject>(const task_tracker_sy
     return jsonObject.dump(defaultJsonIndent);
 }
 
+void to_json(nlohmann::json &jsonObject, const device::TaskCollection::value_type &object)
+{
+    jsonObject["id"] = object.first;
+    jsonObject["label"] = object.second.getLabel();
+    jsonObject["duration"] = object.second.getLastRecordedDuration().count();
+}
+
 template <>
-std::string toJsonString<task_tracker_systems::TaskList>(const task_tracker_systems::TaskList &object)
+std::string toJsonString<device::TaskCollection>(const device::TaskCollection &container)
 {
-    nlohmann::json jsonObject(object);
+    nlohmann::json jsonObject(container);
     return jsonObject.dump(defaultJsonIndent);
 }
 
diff --git a/lib/application_business_rules/serial_interface/Protocol.cpp b/lib/application_business_rules/serial_interface/Protocol.cpp
index 845f9f22f..9ac06bb48 100644
--- a/lib/application_business_rules/serial_interface/Protocol.cpp
+++ b/lib/application_business_rules/serial_interface/Protocol.cpp
@@ -9,10 +9,12 @@ namespace cli = command_line_interpreter;
 // --- define commands ------
 // --------------------------
 #include "JsonGenerator.hpp"
+#include <serial_protocol/DeletedTaskObject.hpp>
 #include <serial_protocol/ProtocolVersionObject.hpp>
 #include <serial_protocol/TaskList.hpp>
 #include <serial_protocol/TaskObject.hpp>
 #include <string>
+#include <tasks/Task.hpp>
 
 using namespace task_tracker_systems;
 
@@ -24,25 +26,62 @@ static const auto info = []() {
 static const auto infoCmd = cli::makeCommand("info", std::function(info));
 
 // command for list
-static const auto list = []() { 
-    const TaskList dummyList = {
-        {.id = 1, .label = "first", .duration = 100U}, 
-        {.id = 2, .label =  "second", .duration = 200U},
-        };
-    serial_port::cout << toJsonString(dummyList) << std::endl; };
+static const auto list = []() { serial_port::cout << toJsonString(device::tasks) << std::endl; };
 static const auto listCmd = cli::makeCommand("list", std::function(list));
 
 // command for edit
-static const auto edit = [](const unsigned int id, const std::basic_string<ProtocolHandler::CharType> label, const std::chrono::seconds::rep duration) {
-    const TaskObject task = {.id = id, .label = label, .duration = duration};
-    serial_port::cout << toJsonString(task) << std::endl;
+static const auto edit = [](const TaskId id, const std::basic_string<ProtocolHandler::CharType> label, const Task::Duration::rep duration) {
+    try
+    {
+        auto &task = device::tasks.at(id);
+        task.setLabel(label);
+        task.setRecordedDuration(std::chrono::seconds(duration));
+        const TaskObject taskObject = {.id = id, .label = task.getLabel(), .duration = task.getLastRecordedDuration().count()};
+        serial_port::cout << toJsonString(taskObject) << std::endl;
+    }
+    catch (std::out_of_range &e)
+    {
+        serial_port::cout << "ERROR: Task not found." << std::endl;
+    }
 };
-static const cli::Option<unsigned int> id = {.labels = {"--id"}, .defaultValue = 0};
+static const cli::Option<TaskId> id = {.labels = {"--id"}, .defaultValue = 0};
 static const cli::Option<std::basic_string<ProtocolHandler::CharType>> label = {.labels = {"--name"}, .defaultValue = "foo"};
-static const cli::Option<std::chrono::seconds::rep> duration = {.labels = {"--duration"}, .defaultValue = 0};
+static const cli::Option<Task::Duration::rep> duration = {.labels = {"--duration"}, .defaultValue = 0};
 static const auto editCmd = cli::makeCommand("edit", std::function(edit), std::make_tuple(&id, &label, &duration));
 
-static const std::array<const cli::BaseCommand<char> *, 3> commands = {&listCmd, &editCmd, &infoCmd};
+// command for create/add
+static const auto add = [](const TaskId id, const std::basic_string<ProtocolHandler::CharType> label, const Task::Duration::rep duration) {
+    try
+    {
+        const auto &[element, created] = device::tasks.try_emplace(id, label, std::chrono::seconds(duration));
+        const auto &task = element->second;
+        const TaskObject taskObject = {.id = element->first, .label = task.getLabel(), .duration = task.getLastRecordedDuration().count()};
+        serial_port::cout << toJsonString(taskObject) << std::endl;
+        if (!created)
+        {
+            serial_port::cout << "ERROR: Task with the specified ID already exists." << std::endl;
+        }
+    }
+    catch (std::out_of_range &e)
+    {
+        serial_port::cout << "ERROR: Task not found." << std::endl;
+    }
+};
+static const auto addCmd = cli::makeCommand("add", std::function(add), std::make_tuple(&id, &label, &duration));
+
+// command for delete/remove
+static const auto del = [](const TaskId id) {
+    const bool deleted = device::tasks.erase(id) > 0;
+    const DeletedTaskObject taskObject{.id = id};
+    serial_port::cout << toJsonString(taskObject) << std::endl;
+    if (!deleted)
+    {
+        serial_port::cout << "ERROR: No task deleted." << std::endl;
+    }
+};
+static const auto delCmd = cli::makeCommand("delete", std::function(del), std::make_tuple(&id));
+
+static const std::array<const cli::BaseCommand<char> *, 5> commands = {&listCmd, &editCmd, &infoCmd, &addCmd, &delCmd};
 
 bool ProtocolHandler::execute(const CharType *const commandLine)
 {
diff --git a/lib/application_business_rules/tasks/Task.cpp b/lib/application_business_rules/tasks/Task.cpp
index 1c97d0d47..b8742943d 100644
--- a/lib/application_business_rules/tasks/Task.cpp
+++ b/lib/application_business_rules/tasks/Task.cpp
@@ -47,4 +47,14 @@ Task::Duration Task::getRecordedDuration()
     return std::chrono::round<Duration>(recordedDuration);
 }
 
-std::map<TaskId, Task> device::tasks;
+device::TaskCollection device::tasks;
+
+void Task::setRecordedDuration(Duration newDuration)
+{
+    recordedDuration = newDuration;
+}
+
+Task::Duration Task::getLastRecordedDuration() const
+{
+    return std::chrono::round<Duration>(recordedDuration);
+}
diff --git a/lib/application_business_rules/tasks/Task.hpp b/lib/application_business_rules/tasks/Task.hpp
index 54c6288c3..7ff20204d 100644
--- a/lib/application_business_rules/tasks/Task.hpp
+++ b/lib/application_business_rules/tasks/Task.hpp
@@ -65,6 +65,16 @@ class Task
      * \returns the accumulated duration
      */
     Duration getRecordedDuration();
+
+    Duration getLastRecordedDuration() const;
+
+    /**
+     * Sets the recorded duration.
+     *
+     * Useful for example if the task has been recorded outside the device.
+     * @param newDuration new duration to apply
+     */
+    void setRecordedDuration(Duration newDuration);
     bool isRunning() const;
 
   private:
@@ -87,8 +97,10 @@ class Task
 
 namespace device
 {
+typedef std::map<TaskId, Task> TaskCollection;
+
 /**
  * *The* collection of tasks to be used by the device application.
  */
-extern std::map<TaskId, Task> tasks;
+extern TaskCollection tasks;
 } // namespace device