The aim of this study was to investigate the relationship between indi
vidual differences in personality and susceptibility to stress in the
workplace. Stress in lecturers employed by a computer training organiz
ation was assessed by means of self-report and measurement of salivary
cortisol output during lecturing and non-lecturing weeks. Neuroticism
, Type A behaviour pattern and locus of control were measured. Self-re
ported stress was found to be much greater during lecturing weeks, but
cortisol levels were unaffected by working conditions. There was a si
gnificant positive correlation between neuroticism and locus of contro
l and a negative correlation between locus of control and Type A behav
iour pattern that approached significance. Multiple regression was emp
loyed to explore relations between personality and stress. Subjects wi
th lower neuroticism scores yielded a bigger increase in reported stre
ss, in the lecturing compared with the non-lecturing week, than subjec
ts with high neuroticism scores. Type B subjects showed a progressive
decrease in cortisol over the working week while Type A counterparts s
howed a resurgence of cortisol towards the end of the week. Finally, T
ype B subjects having an internal locus of control showed a faster dec
line in cortisol level during the lecturing week than the other subjec
ts. Implications of these results are discussed in terms of the import
ance of simultaneously incorporating a variety of individual differenc
es in personality dimensions and stress indices in research designs.