I have identified over 12 major working small group models in the US alone. Some include:

• Cell Church
• Groups of 12
• Holistic Small Groups (Upward, Inward, Outward, Forward)
• Church of Small Groups (Saddleback)
• Small Group Campaigns (Purpose-Driven Groups)
• Meta-Model
• Free Market Cells
• Semester Groups (The Sticky Church by Larry Osbourne, Activate by Nelson
  Searcy)
• Many more could be listed