Cultural critics such as John Caldwell Holt, Paul Goodman, Frederick Mayer and George Dennison have examined education from individualist, anarchist, and libertarian perspectives. Other writers, from Paulo Freire to American educators Herbert Kohl and Jonathan Kozol, have criticized mainstream Western education from the viewpoint of liberal and radical politics. The argument for an approach catering to the interests and learning style of an individual is supported by research suggesting that a learner-responsible model is more effective than a teacher-responsible one.[4] Ron Miller has identified five elements common to educational alternatives:[5]