We do a 15 min. opening with all the kids together. This is our time to learn new songs, work on memory verses, or work on anything we may be presenting as a group during worship on a future Sunday. We also collect offering for the year's mission project, celebrate birthdays and cover any other announcements. We might intoduce the topic if it's the beginning of a rotation and will sometimes ask follow up questions on subsequent Sundays, but it's always very brief. Sometimes 15 min isn't enough time!