The core activity of eRko is the regular out-of-school work with children in small communities – children groups. A programme for children is provided by volunteers for whom eRko regularly prepares training courses and methodical materials. Children meet with their leaders usually on weekly or fortnightly basis. Meetings have a family character. Through activities, conversations, stories, prayers and games children experience with their leaders a joyful community. Through personal example of leaders, they can make steps towards personal maturity and learn to serve others. They develop their talents, knowledge and skills. Leaders of the groups base the work with children on Christian values and their transmission into practical life. In addition to regular meetings, leaders with children organise a variety of themed events, day trips, days of life, days of joy, summer and winter camps. In Slovakia, there are more than 500 eRko children groups.