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Helen F. Neville, BS, RN, is a longtime pediatric nurse and a parent educator who directed the Temperament Project at Kaiser Permanente Hospital in Oakland, California. She is the author of Is This a Phase?; Mommy! I Have to Go Potty!; and What to Do About Sleep Problems in Young Children, 12 Months to 5 Years. Diane Clark Johnson is the coauthor of the first edition of Temperament Tools.