People know one another and care about one another. If someone is missing, others notice. When big churches set up small groups, they are trying to imitate something that comes naturally to a small church. Everyone gets actively involved in the church. Large churches may lose five percent of their members each year.
Small churches retain members better, partly through involvement and largely through relationships.
In general, the larger the church, the more business-like it must function. The senior pastor must be an executive, an administrator. The programs of the church must be well organized, well coordinated, professionally done. There must be a clear organizational structure. Small churches tend to function more informally, more through the relationship networks of the church.