e-Business organizations must frequently face changes in their systems to stay
competitive. However, it is not guaranteed the new systems will be acceptable
for the workers. The EBTAM model is proposed in this paper as a way to study
acceptance before actual deployment of a new system. This model takes into
account other models reported in the literature, but it is essentially oriented
towards small and medium-sized organizations, which have limited resources. The
model was subject to a study with three companies, and the obtained results
were useful to further simplify the model.