How can I ask respondents to recall a specific time period clearly?
Quick answer
State the exact period in everyday language, then anchor it to dates or a defined interval. For example: “Thinking about the seven days from Monday, [date], through Sunday, [date], how many times did you…?” Specify whether the start and end dates count, and avoid vague phrases such as “recently” when respondents might interpret them differently.
The question, the details, the next step.
I’m writing a questionnaire and want people to remember a particular period. What should I put in the question so they don’t each choose a different meaning for “recently”?
Replace “recently” with a period respondents can identify. A useful pattern is: time anchor + exact span + question. For example: “From Monday, [start date], through Sunday, [end date], how many times did you [action]?” The dates are placeholders; fill them in for the actual questionnaire. If the period is relative to when someone answers, say so plainly: “During the seven days immediately before today, how many times did you [action]?”
Choose one approach and use it consistently. Calendar dates are useful when everyone should think about the same dates. A relative window is useful when respondents may complete the questionnaire on different days. Avoid asking people to infer which dates you mean.
Is “in the past week” clear enough? I want a short question, and I’m not sure whether I need to spell out every date.
It may be clear to some readers, but it can be interpreted as the last seven days, the previous calendar week, or a period beginning on a particular weekday. If that distinction matters, spell out the window. A compact relative version is: “In the seven days immediately before today, how many times did you [action]?” A fixed-date version is: “Between [start date] and [end date], inclusive, how many times did you [action]?”
Use “inclusive” only if you want both boundary dates counted, and make sure the dates match the intended span. If the precise boundary does not affect the answer, you can keep the wording shorter—but don’t assume a phrase has one obvious interpretation if respondents could reasonably read it another way.
Some people may not remember the exact number of times. Should I give them a different way to think about the period?
Keep the recall period clear, then make the response task manageable. If an exact count is not essential, you could offer ranges such as “0,” “1–2,” “3–5,” and “6 or more,” adjusting the options to fit your question. If respondents should report an estimate, say that directly: “About how many times…?”
For a longer period, consider asking about a concrete part of it—such as the most recent occurrence—rather than inviting people to reconstruct every instance. For example: “What was the most recent day between [start date] and [end date] that you [action]?” This changes what you measure, so use it only if that information answers your purpose. A clearly stated window cannot guarantee perfect recall; it helps people know which period you mean.
Can you show me a copyable example and a quick check I can use before sending the questionnaire?
Here is a fill-in example:
“Thinking about the seven days from [Monday, date] through [Sunday, date], inclusive, how many times did you [specific action]?”
If respondents answer on different dates, use this version instead:
“Thinking about the seven days immediately before the day you complete this questionnaire, how many times did you [specific action]?”
Before using either version, replace every bracketed placeholder, check that the dates and stated duration agree, and confirm that the action is specific enough to recall. Read the question as someone who has not seen your planning notes: could they tell when the period starts and ends, and what counts as an occurrence? If not, revise the wording or add a short example that clarifies the action—not a new interpretation of the time window.
A practical checklist
Replace vague terms such as “recently” with a named span or specific dates.
Choose a fixed calendar window or a respondent-relative window; do not leave the choice implicit.
State whether boundary dates count when that affects the answer.
Check that the dates match the stated duration and replace all placeholders.
Make the activity being recalled specific, and decide whether you need an exact count or an estimate.
A few more useful answers
Should I use calendar dates or a period relative to the response date?
Use calendar dates when every respondent should consider the same dates. Use a relative period when the questionnaire may be completed on different days, and describe the reference point explicitly.
How long should a recall period be?
Choose a span that fits what respondents need to report and the purpose of the question. There is no single best duration for every questionnaire; pick a period that makes sense for the information you want.
Do I need to define what counts as an occurrence?
Yes, if a respondent could reasonably count the activity in different ways. Briefly specify the action or include a neutral example, while keeping the recall dates unchanged.