We can't predict the many interruptions that happen in our day. 
The most common reason for failure to get through a to-do list relates to unplanned tasks, such as unscheduled calls, e-mails, and meetings.

Interruptions and change

The common struggles to conquer our to-do lists:
<ul>
<li>41% of to­-do items are never completed.</li>
<li>50% of completed to-­do items are done within a day.</li>
<li>18% of completed to­-do items are done within an hour.</li>
<li>10% of completed to­-do items are done within a minute.</li>
<li>15% of the items done started as to-do items.</li>
</ul>

Dealing with to-do lists

We're just not good at constructing our to-do lists. It's not as simple as it looks. 
Many of us aren't any good at formulating the tasks on the list, failing to think through steps and plans, so that when we're faced with too many tasks and too few suggestions on how to proceed, we don't complete tasks. Remember that the to-do list string around your finger is for you to make better plans using the list.

How we're making to-do lists

You give yourself too much time to complete the tasks on your to-do list. But the more time you give yourself to finish something, the less likely it is that you will finish in that timeframe. Research shows that when people do complete tasks, they are done quickly.

Too much time

Most of us put way too much stuff on our lists. And that puts us on the path to failure.
Overstuffing our lists causes a continuous thrum of worry in our heads. And the worry that results from having too many conflicting goals causes our productivity as well as our physical and mental health to suffer.

Too many to-do's

<ul>
<li>Make more specific, actionable plans. </li>
<li>Don't micromanage your tasks, or you'll feel unable to make adjustments.</li>
<li>Give yourself earlier deadlines. </li>
<li>Prioritize. It's easier to focus on 5 things and get them out of the way.</li>
<li>Be realistic about what you can do in a day.</li>
<li>Remember that interruptions will pop up.</li>
<li>Record and celebrate your small wins.</li>
</ul>

Improve your to-do list making

The to-do list is an inescapable, age-old productivity tool. It is our very human attempt to create order in our disorderly lives and an expression of our ability to impose self-control. Most of us, including to-do list haters, keep one, and so do 63% of professionals, according to a LinkedIn survey released earlier this year.

Too much time

Similar ideas to Too much time

Steps For Using The Two-Minute Rule

Doing too much

Dealing with too much stress