Generations of Time Management tools

Authors such as Stephen R Covey have offered a detailed categorization for the hundreds of time management approaches that they invented, disovered or reviewed:

• First generation: These are the reminders which are based on clocks & watches, but with the implementation of computers it has been made possible to alert the time when a task is to be done.
• Second generation: Planning & preparation based on calendar and appointment books includes setting goals using pyramids, etc.
• Third generation: Planning, prioritizing, controlling (using a personal organizer, other paper-based objects, or computer or PDA systems activities on a daily basis. This approach implies spending some time in clarifying values and priorities.
• Fourth generation: Being efficient and proactive using any of the above tools places goals and roles as the controlling element of the system and favors importance over urgency.