Categories
Study categories, explained simply
Each type of study asks different things of volunteers. Here's what to generally expect.
Healthy Volunteer Studies
Studies that invite people without a specific condition to take part, often to help researchers understand typical responses.
What you may be asked to do
- Short questionnaires
- Scheduled visits or check-ins
- Clear written study materials
Observational Studies
Researchers record what happens over time without assigning a specific intervention.
What you may be asked to do
- Surveys or diaries
- Periodic follow-ups
- No assigned intervention
Behavioral Studies
Studies that look at habits, routines, sleep and activity, and how small changes in daily life may make a difference.
What you may be asked to do
- Activity or habit tracking
- Coaching sessions
- Online or in-person visits
Prevention Studies
Research exploring ways to help people stay well, such as lifestyle approaches or screenings.
What you may be asked to do
- Written study materials
- Lifestyle check-ins
- Longer study timelines
Interventional Studies
Studies where volunteers are assigned to a specific approach so researchers can compare results under a written protocol.
What you may be asked to do
- A written study protocol
- Detailed consent documents
- Scheduled study visits
Device Studies
Research involving wearables, sensors or apps, often focused on how easy they are to use in everyday life.
What you may be asked to do
- Trying a wearable or app
- Usability feedback
- Remote or on-site sessions
These are general descriptions only. Each independent program sets its own requirements. FreshStudy Listings does not determine eligibility.