The McFarland Dianic tradition (previously known as Old Dianic) was founded by Morgan McFarland and Mark Roberts in the early 1960s. It is distinguished from the feminist traditions of Dianic Wicca begun by Zsuzsanna Budapest, Starhawk, and others.
The ideas that distinguish the McFarland Tradition as a “Dianic” tradition from other wiccan paths concern the focus upon the "Immortal Goddess in Her threefold aspects of Maiden, Mother and Crone".
"In the McFarland Dianic Tradition the Goddess was never born, and She never dies. She always was, is, and always will be. She is the fertile Void at the Center from which the universe is born."
Another important concept is "Immanence". The Goddess is immanent in her creation. She is not separate from her creation, she is her creation, she gave birth to herself. She is in everything, everywhere. "She is the Goddess of a Thousand Names".
The McFarland Dianic Tradition recognizes goddesses of different cultures and pantheons as different aspects of "The Immortal Goddess". In this sense they are more monotheistic than many other pagan or wiccan groups.
"Her Son and Consort is the Mortal principle that is born, dies and is reborn in an ever-repeating cycle of birth, death and rebirth. The God also is of the Goddess. You could say that He is Her male aspect."
Read more about McFarland Dianic: Female and Male Principles, The Background, Basic Laws