Doctors' stress levels were measured before and after the introduction of a partial shift system as a result of the New Deal, through the administration of the OSI questionnaire. Doctors' opinions regarding the introduction of this new work pattern were collected through the use of an in-depth, semi-structured interview schedule. The study doctors working the on-call rota exhibited higher stress levels than the doctor ‘norm’ group, and higher than most other professional groups. The introduction of a partial shift system resulted in a marked reduction of stress levels in relation to mental well-being and job satisfaction, and a significant reduction in the effect of stress on physical health. The study doctors perceived that the introduction of partial shifts would undermine the close relationship between continuity of patient care, the ‘firm’ system and training. The on-call rota was preferred, providing the remuneration for its antisocial aspects was more appropriate. The abolition of 24-hour working and improvements in residential accommodation were perceived as advantageous. Copyright © 1999 John Wiley & Sons, Ltd.