I've mentioned on my own blog, the evolution of ideas originally presented by psychiatrist Carl Jung. In the 1950s Joseph Campbell’s The Hero With A Thousand Faces, in which he laid out what he called the monomyth, a detailed version of “hero wants something; hero tries to get it and fails; hero tries at last and succeeds; rewards and/or weddings follow” gained traction in the writing circle as students left his classes.
The heroine's journey more closely examines the inner journey of discovery; specifically from a feminist lens. Originally created by Murdock, a therapist working with women, its use as a writing tool is debated. While written with a specific gender in mind, many of the stages share common goals with the hero's journey and are reflections of an inward journey.