A few altitudinal and behavioural principles will bring about a produc
tive liaison between the occupational physician and trade unions. An e
ffective working relationship with these organizations and employee as
sociations can be developed, provided the occupational health care pro
fessionals are impartial in their practice, the loyalty to medicine re
placing any bias toward the favouring of a managerial view. Respect mu
st be given union officials, for in their organization they have statu
s and can advance or defeat various health programs. Union representat
ion on an occupational health committee will gain union support and mi
nimize the filing of health-based grievances. The presentation of occu
pational health information at union meetings will communicate the goa
ls of in-plant programs and familiarize workers, through their accusto
med channels, with the objectives of health care policies and procedur
es.