In this paper we develop an empirical model for heterogeneous human ca
pital investment decisions. We apply this model to the investment in e
nterprise-related training. Three types of training investments are di
stinguished: technical training, economic-administrative training, and
other enterprise-related training. The empirical results show that te
chnical training yields relatively the lowest wage gain, while other e
nterprise-related training yields the highest wage gain. The results s
uggest that access into training is determined by employer selection o
f workers for training and that for workers entry into training is res
tricted. We also find evidence to indicate underinvestment in enterpri
se-related training.