Six Tasks in the Morning, What's Left by Evening
You jot down six tasks in your to-do app in the morning, and by evening, half have slipped to tomorrow, one has been reworded, and one is still sitting there — not finished, but not deleted either. Anyone running a one-person business or working in planning will recognize the scene. It's not that the plan was wrong; it's that plans and days move at different speeds.
We usually chalk up this kind of to-do app procrastination to a lack of willpower. But whether that's really personal laziness, or simply how plans behave by nature, is worth examining. One study set out to answer that question using real usage data.
Tracking 24,000 Tasks Over Six Weeks
Researchers led by Srija Halder analyzed timestamped logs from a widely used daily planner app, covering 24,265 tasks logged by 957 users over six weeks. Rather than assigning tasks in a lab and observing the results, the team studied naturally occurring data — records people generated simply by using the app as they normally would. Self-report surveys were collected alongside the log data.
The study's key move was treating each task as having a lifecycle. The researchers traced a single thread from the moment a task was created, through any edits to its time or wording, to the moment it was logged as completed or abandoned. Their premise: you can only see how a plan actually changes shape by following it from start to finish.
Only One in Four Tasks Was Finished Without a Hitch
Following each task's full lifecycle, the researchers found that tasks split into three broad outcomes.
Only 26.4% of tasks were completed exactly as written, with no changes at all — while 32.0% were abandoned outright, meaning more tasks were dropped than finished cleanly. The rest were postponed, edited, or left unresolved.
Abandoned tasks had patterns of their own. Tasks scheduled for "all day," with no specific time attached, and tasks with long durations, were dropped at especially high rates. Tasks with a set time were abandoned less often — but 77.6% of those were marked complete later than their scheduled time. In other words, pinning down a time gets a task finished, but not necessarily on time.
Users split into distinct groups too. A latent profile analysis of 909 users identified a highly engaged group (11.1%), a low-engagement group (19.7%), and a passive group (69.2%). Seven out of ten people, in other words, had the app installed but opened it only sporadically. The variable that separated these groups was how many days users actually opened the app — a number that was also linked to whether they responded to the follow-up survey.
What to Change When You Plan
For solo business owners and planners, these findings translate into a few concrete habits.
First, cut down on "all day" tasks. Items with no set time were abandoned at unusually high rates. Something like "call the vendor" or "draft the quote," written down with only a vague intention to get to it "sometime today," has a better shot at survival if you pin it to a specific morning hour.
Second, break long tasks into pieces. The finding that lengthy tasks were more likely to be abandoned is a signal not to write down a big block like "finish the business plan" as a single item. Write it as one piece you can actually finish today, and you'll actually see it marked done.
Third, don't count finishing late as failure. Three out of four scheduled tasks wrapped up later than planned. If you build slack into your schedule from the start, assuming things will run over, a delayed item is less likely to knock every task after it off the rails.
Fourth, manage how many days you open the app. The metric that separated user types in the study was simply how many days people actually opened it. The first defense against to-do app procrastination is the habit of opening the app once a day.
A Word of Caution on These Numbers
This study is limited to one app over a six-week window. There's no basis for assuming the same ratios would hold in a different app, or on paper. The study summary alone doesn't tell us what country the users were in or what kind of work they did.
App logs also show behavior without explaining the reasons behind it. There's no way to tell whether a task logged as "abandoned" was truly never done, or was finished outside the app but simply never marked. And the link between survey completion and days of app activity is a correlation, not evidence that opening the app more often makes someone more diligent.
Still, the takeaway is clear. Evaluating a planning tool means looking not just at the moment a task is written down, but at everything that happens to it afterward — the edits, the delays, the disappearances. If there's an item on your own list that keeps getting pushed back day after day, check whether it's an "all day" task or too big a chunk before you blame your willpower.
