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This research proposes an assessment and decision support model to use when a driver should be examined about their propensity for traffic accidents, based on an estimation of the driver's psychological traits. The proposed model was tested on a sample of 305 drivers. Each participant completed four psychological tests: the Barratt Impulsiveness Scale (BIS-11), the Aggressive Driving Behaviour Questionnaire (ADBQ), the Manchester Driver Attitude Questionnaire (DAQ), and the Questionnaire for Self-assessment of Driving Ability. In addition, participants completed an extensive demographic and driving survey. Various fuzzy inference systems were tested and each was defined using the well-known Wang-Mendel method for rule-base definition based on empirical data. For this purpose, a programming code was designed and utilised. Based on the obtained results, it was determined which combination of the considered psychological tests provides the best prediction of a driver's propensity for traffic accidents.The best of the considered fuzzy inference systems might be used as a decision support tool in various situations, such as in recruitment procedures for professional drivers. The validity of the proposed fuzzy approach was confirmed as its implementation provided better results than from statistics, in this case multiple regression analysis.

Purpose The purpose of this paper is to propose a methodology for the comparison of business units and to illustrate its implementation. Job stress is introduced as a mediator variable. A postal company is taken as a case study and its three business units are compared. The units (i.e. employees who have direct contact with customers) analyzed are postal clerks, couriers and call center operators. Design/methodology/approach Quantitative data were collected using two questionnaires: the first to assess the state of predefined organizational parameters, and the second to measure the stress levels of employees. The χ2 test of independence (χ2 test) and Fisher’s exact test are used to calculate correlation. Work stress score and stress distribution index, which are proposed in this study, are used to quantify the levels of stress, the state of organizational parameters and possible improvement points, as well as to compare the business units. Findings According to the results, the most demanding job is that of couriers, followed by postal clerks and call center operators. Originality/value The proposed model could be used to assess and improve businesses and to reduce the stress levels of employees. Further, a model for the comparison of business units might be a useful tool for managers in defining working hours, breaks, length of holiday periods and even in creating a wage structure.

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