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diff --git a/tiger-compiler/src/task/task.hh b/tiger-compiler/src/task/task.hh
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+/**
+ ** \file task/task.hh
+ ** \brief Declare the task::Task class.
+ */
+
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include <task/task-register.hh>
+
+namespace task
+{
+  /** \brief A function bound to a command line option.
+
+  The purpose of the Task class is to abstract the execution of a module
+  and the tasks on which its execution depends.  This is an implementation
+  of the Command Design Pattern.
+  */
+  class Task
+  {
+    /** \name Ctor & dtor. */
+    /** \{ */
+  public:
+    /** \brief Construct a Task.
+
+    \param name      name of this task (used for long option)
+    \param module_name     name of the module to which the task belongs.
+    \param desc      description of this task
+    \param deps            optional space separated list of task names
+    */
+    Task(const char* name,
+         const char* module_name,
+         const char* desc,
+         const std::string& deps = "");
+
+    /// Destroy this Task.
+    virtual ~Task() = default;
+    /** \}*/
+
+    /** \name Abstract methods.
+     ** \{ */
+  public:
+    /// Execute this task.
+    virtual void execute() const = 0;
+    /** \} */
+
+    using tasks_list_type = TaskRegister::tasks_list_type;
+
+    using deps_type = std::vector<std::string>;
+
+    virtual deps_type resolve_dependencies(tasks_list_type& active_tasks) const;
+
+    /** \name Accessors.
+     ** \{ */
+  public:
+    /** Access to 'name'.
+
+    'const char*' is preferred to 'std::string' because TaskRegister
+    calls function requiring 'const char*'.
+    The use of 'std::string::c_str()' is so forbidden and a call to
+    'strdup(std::string::c_str())' would imply dummy memory leaks. */
+    const char* name_get() const;
+
+    /// Access to 'module_name'.
+    const char* module_name_get() const;
+
+    /// Access to 'fullname'.
+    const char* fullname_get() const;
+
+    /// Access to 'desc'.
+    const char* desc_get() const;
+
+    /// Access to tasks dependencies.
+    const deps_type& dependencies_get() const;
+
+    /** \} */
+
+  public:
+    /// Display dependencies of this task .
+    void print_dependencies() const;
+
+  public:
+    /// Normalize the name of a task.
+    static std::string normalize(const std::string& task_name);
+
+  protected:
+    /// Task name.
+    std::string name_;
+    /// Task name plus short name.
+    std::string fullname_;
+    /// Module name to which the task belongs.
+    const char* module_name_;
+    /// A short description of this task (displayed in program usage).
+    const char* desc_;
+    /// Contains the name of the tasks on which this one depends.
+    deps_type dependencies_;
+  };
+
+} // namespace task
+
+#include <task/task.hxx>