This document discusses conducting longitudinal diary studies. It provides tips for running a better diary study, including creating an effective template, understanding the data collected, and keeping users engaged. Some key tips are to recruit extra participants to offset dropouts, use a recruiter to save time, communicate clear deadlines, make the template easy for participants to use with sample entries and questions separated from answers, require daily entries to maintain engagement, and talk to participants directly for clarification and support. Diary studies provide unique insights into infrequent tasks, help usage, issue resolution over time, and can be conducted without travel at a lower cost than site visits.