The Mind Is for Having Ideas, Not Holding Them
When you try to use your mind to simultaneously track all commitments, tasks, and ideas, the brain continuously consumes cognitive resources maintaining these 'open loops,' leading to anxiety, distraction, and inefficiency. Only by externalizing everything into a trusted system can you truly free the brain to do what it does best: creative thinking and present-moment decision-making.
Source: Getting Things Done, David Allen, 2001 (Viking) / Ready for Anything, David Allen, 2003 (Viking)
A Clear Next Action Is the Key to Eliminating Procrastination
Most procrastination is not due to laziness or lack of willpower, but because tasks are defined vaguely — when you face 'work on Project X,' the brain cannot execute directly because it is not a specific physical action. Breaking each task into an immediately executable 'next action' (e.g., 'email Zhang San to confirm meeting time') eliminates decision friction and makes execution natural.
Source: Getting Things Done, David Allen, 2001 (Viking)
A Trusted External System Is the Foundation of Psychological Calm
'Mind Like Water' is not emptiness but the ability to respond to any challenge with appropriate force — neither overreacting nor underreacting. The prerequisite for this state is having a trusted external system tracking all your commitments, with confidence that nothing important will fall through the cracks. This sense of trust is the true source of psychological calm.
Source: Getting Things Done, David Allen, 2001 (Viking) / Making It All Work, David Allen, 2008 (Viking)
The Weekly Review Is the Core Habit for Maintaining System Effectiveness
The GTD system is not a one-time setup that works forever; it requires regular 'reviews' to stay clean and current. The Weekly Review is GTD's most important habit: emptying inboxes, reviewing all project lists, and updating next actions. Skipping the Weekly Review causes the system to gradually lose credibility, prompting the brain to resume tracking work and losing psychological calm.
Source: Getting Things Done, David Allen, 2001 (Viking)
GTD Five-Step Workflow
Capture-Clarify-Organize-Reflect-Engage: transforming all inputs into a manageable action system
An executive receiving 200 emails daily uses the GTD system to categorize all emails into 'Next Actions,' 'Projects,' 'Waiting For,' and 'Someday/Maybe,' processing the inbox only once daily and completely eliminating email anxiety.
Personal ProductivityTask ManagementKnowledge Work
Two-Minute Rule
If something can be done in two minutes, do it immediately — because the cost of deferring it exceeds the cost of completing it
When processing emails, immediately reply to emails requiring brief responses rather than marking them as 'to-do.' This simple rule can eliminate a large backlog of tasks, as most 'small things' accumulate to become the real productivity killers.
Task ProcessingDecision EfficiencyDaily Work
Horizons of Focus
Six levels from next actions to life purpose, ensuring daily actions align with long-term vision
When someone feels lost or busy without direction, use 'Horizons of Focus' to check: do current actions serve projects? Do projects serve areas of responsibility? Do areas of responsibility serve 1-2 year goals? Tracing upward layer by layer finds the connection between action and meaning.
Strategic PlanningLife PlanningPriority Management
Corporate Consulting Practice Period
Refining GTD methodology through training practice in hundreds of companies
During this period, Allen provided efficiency training to various companies, gradually developing the core GTD framework. He observed the universal 'open loops' problem faced by knowledge workers and validated the 'empty the mind + clarify next action' solution in practice.
GTD Methodology Launch Period
Publication of Getting Things Done sparking a global productivity management revolution
After Getting Things Done was published in 2001, GTD quickly became the productivity bible for knowledge workers worldwide. Allen toured globally speaking, and the GTD community flourished online. Ready for Anything was published in 2003, further deepening GTD philosophy.
System Deepening and Expansion Period
Expanding GTD to higher levels of life management
Making It All Work was published in 2008, introducing the 'Horizons of Focus' framework and expanding GTD from task management to life goal alignment. Allen continues providing corporate training through David Allen Company and continuously updating GTD practices for the digital age, with a revised GTD edition published in 2015.
