The dynamics of an organization's environment forces managers to introduce modern highly-organic organizational forms such as project, task, hypertext, and network structures. The transformation of organizational structures towards solutions that are more organic in nature implies changes in an organization's human resource management. Such changes also involve employee selection. The goal of this article is to demonstrate differences between employee selection processes in organizations with traditional structures (leaning towards the mechanistic) and modern ones (more organic). The overall conclusion is that in organizations with more organic structures the process of employee selection is shorter and utilizes more advanced tools - competency and psychological tests, and assessment centers). Other employee selection criteria were also important in organizations applying modern solutions. These included general knowledge, emotional intelligence, planning skills, work organization abilities, team work, and the ability to reach a compromise. This paper is based on literature studies and empirical research conducted in 2005 on 131 companies.