Punchcut recently published some thoughts about using diary studies to inform mobile UX, including how to use mobile technology to support the study itself.
“Participants find it difficult to remember to make entries. Studies that require scheduled entries suffer from gaps in activity because participants often forget or lose motivation. Using our mobile diary tool, we were able to push SMS reminders to them if they had not done so recently. We could schedule reminders intelligently so they did not become intrusive. Our team also found reminders to be a great opportunity to provide encouragement, helping participants maintain high levels of engagement.”
Link: Uncovering Context With Mobile Diary Studies (punchcut.com)