What Zeigarnik noticed, and what has held up
In the 1920s, the psychologist Bluma Zeigarnik reported that waiters seemed to recall open orders better than ones already paid. Her experiments with interrupted and finished puzzles suggested that tasks left undone are remembered better than those completed. The story became a staple of marketing psychology, and marketers have repeated it ever since.
Later studies have not always reproduced that memory effect, so treat it with care. The part that has fared better is the urge to return to an interrupted job, described by her colleague Ovsiankina in the same decade. For a website, that is the useful bit: people often want to go back and finish what they started.
Progress helps people finish
Two later studies show how powerful visible progress can be. In the mid 2000s, Nunes and Drèze gave car-wash customers a loyalty card. One needed ten stamps with two already added, another needed eight with none. Both required eight more washes, yet the card with a head start was completed far more often.
Kivetz, Urminsky and Zheng, also in the mid 2000s, saw coffee-card customers buy more often as the free coffee drew closer. Together the results suggest that a sense of momentum matters. A step counter on a form, or a note saying you are halfway there, gives the same lift without costing you anything. Testing changes like these is everyday conversion rate optimization.
A Langley landscaper and the half-finished estimate
Picture a landscaping firm in Langley whose website asks for a yard size, a budget range, the features wanted and a phone number. Many visitors begin on a phone during a lunch break and are called away. By evening the tab is closed, and without conversion tracking the firm never learns the person was interested.
As part of a small website redesign, the firm rebuilds the form as three short steps with a bar showing where the visitor is, and the first step is pre-filled with the choice they made on the landing page. After the second step it saves what has been typed, and offers to email a link so the person can continue from a computer later.
Reminders that help, and reminders that nag
If the visitor has agreed to email marketing, send a single message the next day. Mention the specific thing they started, link straight to the saved step and say what is left to do. Keep it short and plain, and offer a phone number for anyone who would rather talk. A second note a few days later is the limit.
Beware the common mistakes. Do not claim a person is almost finished when they are not, do not hide the way to opt out and do not send a daily stream. Used honestly, this is a courtesy that saves effort. Used badly, it turns a half-finished enquiry into an unsubscribe.
Where else it fits
The same thinking helps with lead generation forms and with onboarding a new client, where a short checklist shows what has been received and what remains. A clinic can show that intake forms are done and only the appointment is left. An accountant can list the documents still needed, ticking each off as it arrives.
In every case, the aim is to make the next step small and the path back obvious. You are not exploiting a quirk of memory. You are removing friction for someone who already wanted to finish. If the effect is weaker than the legend says, the convenience still counts for plenty. If you are unsure where visitors drop away, the growth check is a quick place to start.
- Split any long form into short steps and show a simple progress bar
- Start the bar partly filled when the visitor has already made a choice
- Save entries automatically and offer an emailed link to resume later
- Send one reminder that names the exact step left, then stop
Making returns easier as 2027 approaches
Many people now hop between phone, laptop and tablet within one task. Sites that let them pick up where they stopped will feel considerate while others feel forgetful. Measure how many people begin a form and how many finish, then test one change at a time and keep what helps.
- 01Count starts and finishes for each form monthly
- 02Test one fewer field before adding a progress bar
- 03Review reminder emails for tone as well as timing
Questions & answers
Partly. The tendency to resume an interrupted task is fairly well supported. The claim that unfinished tasks are remembered better than finished ones has not always been reproduced, so use the idea as a design prompt, not a law.
They often help when the form is long and the bar moves steadily, though results vary by site. A bar that stalls or jumps can backfire. Test with your own visitors, and keep the number of steps small.
Usually one, perhaps a second a few days later. Mention the specific step they reached, link to it and make leaving the list easy. More than that starts to feel like pressure and can harm your sender reputation.
No. Inventing progress is manipulative and breaks trust when the visitor realizes it. Show a head start only when it is real, for example a choice they have already made or a step they have already completed.
