In recent years, many companies stepped up security efforts in chemical and process facilities. The need for the implementation of technological and organizational measures is accompanied by an increased attention for the human factor of the company's security policy. In order to create a strong security culture, a high level of security awareness among employees is needed. The aim of this paper is to measure the impact of a training session on the level of security awareness. Based on the results of a quantitative research, the effectiveness regarding the security knowledge, attitude and behavior.of employees is measured.