This study uses a task delegation questionnaire to compare 1973 physician extender practices in seven primary care-oriented sites with a physician attitude survey made in 1969. One additional site using no physician extenders was included as a control. The study involves both major types of physician extenders (physician assistants and nurse practitioners) in ambulatory practices with at least one year of experience in using such personnel. With minor exceptions, actual task delegation patterns conform with the 1969 attitudes of physicians as to which tasks "could and should" be delegated to physician extenders.