Framework
Three diary study sampling methods
The three ways to decide when participants make a diary study entry: at fixed intervals, when a random signal arrives, or whenever a set event happens. It is for UX and product researchers planning a longitudinal study. Pick the method before you write the prompts. Event-contingent sampling is the usual choice in product research because it cuts irrelevant entries. Koji can run the follow-up interviews afterwards.
Where this appears
What's in this framework
- Interval-contingent: Participants report at fixed times, for example every evening at 7pm.
- Signal-contingent: Participants report when a random prompt or notification arrives.
- Event-contingent: Participants report each time a set event happens, like opening your app. The most common choice in product research.
Use this image
Free to use in your docs, decks and posts under CC BY 4.0, as long as you credit Koji with a link to this page. To embed it, paste this into your page:
html
<a href="https://www.koji.so/visuals/diary-study-sampling-methods"><img src="https://www.koji.so/visuals/diary-study-sampling-methods/diary-study-sampling-methods.png" alt="Framework of three diary study sampling methods: interval-contingent at fixed times, signal-contingent on a random prompt and event-contingent after an event." width="1200" height="630" /></a>
<p>Source: <a href="https://www.koji.so/visuals/diary-study-sampling-methods">Three diary study sampling methods</a>, Koji</p>
