In a bank or a similar organization offering e-services, there is constant pressure to innovate existing products, create new services or implement regulatory requirements. Each delivered software should be tested to detect
and remedy supply deficiencies. The aim of the paper is to describe the software testing process in a bank and afterwards prepare the simulation model, based on real data, to estimate the appropriate number of human resources
during the given process and to suggest changes in the process leading to higher efficiency. SIMUL8 software, as one of the discrete event simulation software type, was chosen for modelling and simulation purposes. The
result showed not only the recommended number of employees but also the necessity of the changes in the process itself.