Every Committee should be proactive to share information to all owners regularly and in a useful format and medium. A simple rule to follow is, every time a project changes provide an update, the bad news is better than no news.
When undertaking long projects in your building consider adding a Projects Page to your website and adding key information and updates, then you simply direct all owners to the projects page where they will always find the newest information.
Committees should also be open to feedback from owners and tenants. Try google forms for a quick and easy survey that you can issue each year, you can also integrate your feedback into your website.