Inter-generational ministry stands in contrast with other modes of ministry more traditionally seen in local churches, such as Sunday schools and youth ministries. In Sunday school, children, youths, and sometimes adults, are instructed by teachers who are, typically, adults. Classes are usually divided by age groups, as in secular schools. In youth ministries, teens or young adults (especially college age) gather in groups presided over by a "youth minister". These groups, which are often part of parachurch organizations, focus on peer fellowship and instruction of their members.