Table 2 Retention planning activities

1. Establish a local retention working group

2. Identify funds within the study budget for retention

3. Design the study to maximize participant reach, engagement and retention (see also Tables 3, 4, 5), e.g.,

 – Develop and refine a retention protocol with theory-informed and evidence-informed strategies

 – Develop specific retention tools (e.g., honoraria, study fact sheets)

 – Develop a public study presence (e.g., name, logo, website, letterhead, business cards, toll-free participant phone line)

4. Train and support research staff

5. Develop a robust participant-tracking system (see also Table 3)