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Whether they are called small groups, cell gatherings, home groups or growth groups - these are environments whereby long-time parishioners and new people who are curious about faith can be nurtured. They can be safe places to ask tough questions, to hear the powerful stories of Jesus, and to be prayed for.   
The Anglican Diocese of Toronto has an excellent article on the scriptural foundations, faith formation benefits and options for forming small learning groups. It's called Growing Disciples in Small Groups.