...says that when working on big rocks (the most important tasks), you need to minimize distractions as much as possible.
You're more likely to complete small tasks in a single working session, and more likely to make better progress on big tasks/projects that you need to work on over multiple sessions.

The Do Habit

To clear your mind and improve focus, get your ideas and to-dos out of your mind and onto a list. 
Documenting to-dos in the moment lessens the likelihood that you'll forget to do something and gives you a master list of to-dos to reference when you're trying to decide where to direct your time.

The Collect Habit

It's a productivity system that teaches how to take a simple approach to improving your productivity, by encouraging you to focus on forming one productivity-boosting habit at a time.

Zen to Done (ZTD)

<ul>
<li>Collect: Get ideas and to-dos out of your brain and onto a list.</li>
<li>Process: Review your list daily and decide how to act on each item.</li>
<li>Plan: Pick a few high priority items to accomplish each week and every day.</li>
<li>Do: Schedule time to accomplish your selected to-dos without interruptions.</li></ul>

The Minimalist Habits of Zen to Done

For your to-do list:
<ul>
<li>If the task takes less than 2 minutes to complete, do it immediately and get it off your list.</li>
<li>If the task takes longer than 2 minutes to complete, set it aside for later.</li>
<li>If someone else should do the task, send it to that person right away.</li>
<li>If the task doesn't require any action, delete it immediately to get it off your list.</li>
<li>If you just need to file the item for reference, put it where it needs to go right away.</li>
</ul>

The Process Habit

Read about the most popular productivity systems and choose the one that fits you best

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Books

problemsolving

Problem Solving

productivity

Productivity

communication

Communication

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Personal Development

Productivity Systems

There's a reason New Year's Resolutions are so hard to keep: Reinventing the way you live overnight requires a willpower that most of us don't have. And yet-many popular productivity systems ask you to uproot your work in just that way. Changing a single habit is...

The Collect Habit

Similar ideas to The Collect Habit

The Minimalist Habits of Zen to Done

The Popova Method: How to take notes

Get Your To-Dos in Order