It is actual to elucidate the contribution of each factor to the professional competence of guards and the infl uence of these factors on their superior's appraisal. Therefore we hypothesize that assessment of the contribution of the guard's personal features into his professional competence and their infl uence on their appraisal by superiors will be helpful in staffi ng private security services and improving their working qualities. The object of the current study was the psychobiological

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... professional factors determining the professional competence of a security worker. The aim of the work was to establish the role of separate factors determining the professional competence of security workers, as well as to study the professional competence of security workers in formativeness of superior's appraisal and psychobiological factors, qualitative indices and their analysis. The study subject was 118 security workers and their four direct superiors.Factor analysis applied for competence assessment of security workers has shown that in internal appraisal (of summarized identifi ed variables) the highest value belongs to psychic qualities (22%) as well as age and physical development (20%), followed by physical preparedness (16%), professional activity (15%), theoretical and practical preparedness (14%) and fi ghting abilities (13%). The (external) appraisal by security service superiors, when only the observation and questioning methods are applied, are not suffi ciently informative and reliable. The factor of the-oretical and practical preparedness has been found to have a similar weight both in external and internal appraisal, however, a number of factors, such as psychic qualities, physical preparedness and fi ghting abilities, in internal and external appraisal have a cardinally opposite value.