AbstractVocational training incidence for those at work is frequently financed partly or wholly by employers, who then lose part of their investment return if workers migrate to other firms. We investigate the incidence of training and the incidence of job‐to‐job mobility for a large sample of British workers in 1984 and 1989. We also analyse the role of sectoral technology characteristics in influencing patterns of both training and inter‐firm mobility.Our results demonstrate that job‐to‐job mobility is highest for the young and higher for those with formal educational qualifications than for the unskilled. These are also characteristics which engender a higher training propensity; so, unavoidably, private gains to training for employers are below social gains for these young people. Public‐sector workers have high training rates but low mobility; this perhaps explains the lack of perception of the poaching problem by successive governments. Sectoral R&D activity is associated with more training and less mobility for men; in contrast, women are more likely to train and are less mobile if the rate of adoption of innovati