Ralph Winter addresses the issue of regionalism and nationalism in frontier missions work and why believers in unreached people groups can't do their work without outside help.

Ralph Winter addresses the issue of parochialism in frontier missions work using the example of South Korean bi cultural missionaries.

Ralph Winter addresses the issue of amateurism in frontier missions work and the unique preparation of a frontier missionary.

Donald McGavran's work was the forerunner to the principles found in church multiplication movements. Here are 7 key principles he espoused.