African Independent Churches are known for their tendency to split, and to keep splitting. It would not be surprising if the churches were a little wary of each other and not keen to interact with each other. At one level I found this to be true of the many little congregations of churches scattered all over, each independent and isolated. At another level, I was surprised to see the amount of cooperation between some churches, much of it in the form of associations.
It was impossible to know how many associations of independent churches operated in Soweto, but the few I encountered were similar, with practical needs being the main reason for membership. Church leaders had to battle with bureaucracy to establish themselves and looked to the association for assistance for a range of issues, including registration of churches, marriage officer licences, and a host of issues arising from a virtually universal wish to have a "proper" church building. The lack of much formal education on the part of most independent church leaders contributed to their problems of communication with authorities, who were often unsympathetic white officials.
During the fieldwork period, the largest of these associations in Soweto was AICA, with a membership in the area of over one hundred churches. During this period AICA rose to the height of its prestige as the largest and most successful association in the country. This was helped by the Christian Institute, which provided advisors and was able to raise considerable amounts of money that enabled AICA to run an annual conference, workshops and even start a theological college. Unfortunately, the policy of providing AICA executive members with quite generous subsistence and travel allowances led to the downfall of the organisation as its members competed acrimoniously for the available resources. By 1974 it had all but collapsed entirely.
I encountered only one other association of independent churches operating in Soweto, and that was the Pentecostal Mission Church Association. This was an association of some 60 independent churches, the majority of which were Zionist-type. It was led by an elderly white man, Archbishop J.H. Abel, who had a primary school education and was a former railway worker. He had left the Dutch Reformed Church and started mission work as an Apostolic among African people. He received a vision instructing him to form an association of churches and work in the African townships. He took the titles Archbishop and White Superintendent Adviser, and the PMCA was formed. The role of the association was to assist member churches to become better organised by drawing up a constitution to be used by all members, to assist them in their relationships with various authorities, and to give advice. In this regard the PMCA issued regular newsletters which included short Bible-studies as well as practical advice, for example on building churches and handling church funds. Like AICA, the PMCA had an Executive Committee to control the affairs of the association between the annual conferences. It had virtually no funds, and Archbishop Abel appeared to have a tight rein on the organisation. 
For a fuller account of the rise and fall of AICA see Chapter 8, Martin West, Bishops and Prophets in a Black City.