The Acheson Report concluded that the process of infectious disease notification in England and Wales was unsatisfactory and recommended that it should be reviewed. However, the success of any notification system will depend on the knowledge and motivation of general practitioners, who are responsible for a large proportion of infectious disease notifications. A district-wide telephone survey was conducted in Croydon among general practitioners to assess the level of awareness of which diseases are on the statutory notification list. Respondents' opinions were also sought on the composition of the present list. Results indicated that a generally high level of awareness contrasted with a relative paucity in knowledge of certain of the more common diseases. Differences in knowledge were not associated with the sex, the length of time since the doctor qualified or the number of partners in the particular practice. Motivation may be a particularly important factor underlying the present incompleteness of notifications. A large proportion of doctors stated that legionellosis, AIDS, brucellosis and listeriosis merited statutory notification.