This is a transcript of the 1966 Eleanor Clark Slagle Lecture delivered by Betty Yerxa. you might want to get the old edition of the entire collection or simply read the pdf's online. The ECSL collection pretty much includes every major contributor to OT thought over the past half century and you would do well to check them out. Gary Kielhofner was both a prolific and excellent writer, plenty of his stuff floating around on Amazon used.