Ivy Lee Method vs Time Blocking: Which Should You Use?

Both the Ivy Lee method and time blocking aim at the same problem: a day that gets spent on whatever shouted loudest. They solve it from opposite ends. The Ivy Lee method limits what you plan to do. Time blocking decides when you will do it. Which one fits depends mostly on how much of your day is under your own control.

The two methods in one paragraph each

The Ivy Lee method. At the end of the day, write down the six most important tasks for tomorrow, rank them by importance, and work through them in order, finishing each before starting the next. Unfinished tasks move to the next list. There is no clock in it. For the full routine and its history, see the Ivy Lee method explained.

Time blocking. You divide your day into blocks on a calendar and assign each block a task or a type of work. Cal Newport, among others, advocates it, and it is widely used by people who want their calendar to reflect their priorities instead of just their meetings.

Side by side

	Ivy Lee method	Time blocking
What it limits	The number of tasks (six)	The time available to each task
Main question	What matters most?	When will I do it?
Setup each day	A few minutes	Often 10 to 20 minutes
Knows how long things take?	No	Yes, you must estimate
When the plan breaks	Re-rank or move on	Re-block the rest of the day
Best for	Choosing priorities	Fitting work around fixed commitments

Where the Ivy Lee method is stronger

It is forgiving. If a task takes three hours instead of one, the list does not collapse. You are simply still on task one, which is where the method says to be. Time blocking asks you to estimate durations, and people are consistently optimistic at this. The “planning fallacy” that Daniel Kahneman and Amos Tversky described in 1979 is exactly this tendency to underestimate how long our own tasks will take.

It is quick. Choosing six items and ordering them takes a few minutes. That matters because a planning habit that is expensive tends to get dropped.

It is hard to over-plan. The cap does the work that discipline otherwise would have to.

Where time blocking is stronger

It confronts the real number of hours. Six tasks can look reasonable until you notice you have meetings from 10 to 4. A calendar makes that visible immediately. The Ivy Lee method has no sense of time, so it will let you write a list that cannot fit in the day.

It protects deep work. A block called “write proposal, 9 to 11” is harder to give away than “write proposal” sitting third on a list.

It suits people with fixed commitments. If your day is mostly appointments, classes or shifts, the calendar is already the main structure and tasks have to fit into it.

How to combine them

You do not have to pick one. A combination that works for many people:

1. In the evening, write your six tasks and rank them (Ivy Lee).
2. Look at tomorrow’s calendar and be honest about the free hours.
3. Put your top one or two tasks into protected blocks, sized generously.
4. Leave tasks three to six unscheduled. Work them in rank order whenever a gap opens up.
5. If it falls apart, drop back to the list. The ranking tells you what to do next without any re-planning.

This keeps the strengths of each: the list says what matters, the calendar protects the time for the most important items, and the unscheduled tasks cost nothing when the day goes sideways.

A quick way to choose

• Mostly your own time, with unpredictable interruptions: start with the Ivy Lee method.
• Mostly fixed appointments with a few open stretches: time block first, and use a short ranked list for what goes into the gaps.
• Both, which is most people: use the combination above.

Whichever you pick, give it a fair test of a week or two. The method that survives your messiest day is usually the one worth keeping. If you want a tool built around the six-task list, Ivy Lee Tasks is one.