The diploma thesis focuses on the possibilities of predicting employees' psychological capital in times of Covid-19. The theoretical part describes psychological capital (its structure, importance in the context of work environment and methods of its measurement and development). It also deals with mental health in the workplace and with selected factors of mental health (team social support, engagement, stress, qualitative and quantitative job insecurity). The empirical part of the thesis aims to verify whether selected factors of mental health can be evaluated as significant predictors of psychological capital. The research sample includes 127 employees of the business organization. The following methods were used to measure the analyzed variables: Psychological Capital Questionnaire - 12 (PCQ-12), The Team Performance Inventory (TPI - only the items "Trust, safety and support" of subscale "Participation"), Utrecht Work Engagement Scale (UWES), Perceived Stress Scale - 10 (PSS- 10), Qualitative Job Insecurity Scale (QUAL-JIS) and Job Insecurity Scale (JIS). The results of multiple linear regression analysis show that in our study subjectively perceived level of stress (ß = -.4078, 95% CI = [-.6006, -.215], p < .001) is the strongest predictor of psychological capital. The analysis further shows..
