1) Engagement with community members is important to obtain better quality data from higher survey response rates and richer responses, as well as to save money through reduced recruitment costs.
2) The document discusses setting engagement goals and creating an engagement plan to achieve those goals through tactics like monthly newsletters, annual surveys, highlighting top community members, and providing rewards.
3) The key to engagement is having members feel like they can express their opinions and that their feedback makes a difference, rather than just participating for rewards.