The European Union’s Green Deal emphasises the importance of improving the efficiency of the energy sector in its countries, which is why the issues involved are relevant in both scientific and practical terms. The article sets out the hypothesis that conveying the state of the economic efficiency of energy development by grades does not reflect the real situation. Instead of ranks, it is proposed to form homogeneous groups of some countries based on non-linear data normalisation instead of today’s universally used linearisation. Grouping the euro area countries in the European Union on the basis of the value of the cost-effectiveness indicator for the energy development of their industrial sector confirmed the appropriateness of the proposed method-ology. In this way, three groups of countries were formed according to the level of cost-effectiveness achieved. The proposed methodology for grouping countries is universal and can be used for international comparisons of any kind.

Requirements of the international standard ISO 45001:2018 were analysed to identify the need for monitoring, measuring and analysing the functioning of the occupational health and safety management system. This analysis has made it clear that the effectiveness of the development and implementation of the occupational health and safety management system depends on the assessment methodology. The study focused on existing studies and publications on the assessment of processes, including those related to occupational safety, assessment methods or qualitative methods, and statistical methods used for assessment. As a result, the topic has been proven relevant, and the goal of the article was determined: to study the possibility of using qualimetric methods for evaluating the labour safety management system. A survey was conducted among workers at a machine-building enterprise to evaluate the occupational health and safety management system. Verbal scales were proposed to process the study results as they allow quantitative ratings to be obtained on the coded scale of the desirability function. The study result is a technique for obtaining a quantitative assessment of the occupational health and safety management system. This technique is universal and can be applied to any enterprise. It can also be used to make managerial decisions regarding the improvement of the occupational health and safety management system.

Investment, the entry of foreign firms depends of a large extent on the country’s goodwill, which is reflected in various ratings. This representation of the situation is approximate, as it does not estimate the differences between the values of the indicators with adjacent grades. This can be avoided by dividing countries into homogeneous groups. It is appropriate to do so on the basis of non-linear grouping rather than linear grouping. It is based on the transformation of data into a dimensionless scale and linear grouping. In the case, its homogeneity increases thanks to the levelling of the most distinctive values and the alignment of the statistical characteristics of the groups. The aim of the article is to propose in principle, a new approach to the ranking of countries on the basis of their level of economic development. It was found that the nonlinear decision of countries into homogenous groups and compared to the linear grouping more accurately reflect the current situation.

The Covid-19 pandemic mainly affected those target groups who, due to the nature of their duties, were unable to isolate themselves. The consequences of such work are psychological tension with various symptoms. In this situation, the formation of a system for localizing its consequences becomes a very important task. Three parts are distinguished: a quantitative assessment of the scale and nature of the pandemic, a quantitative assessment of the need to localize the consequences and the analysis of current system; third, the formation of a monitoring system. The chosen system allows verbal assessments to be transformed into quantitative ones. Based on it, the aggregated values of seven essential signs of psychological stress in the target groups (medical and social workers, police, customs officers, educators, pharmacists, and entrepreneurs) were identified: anxiety (0.80), stress (0.78), aggression (0.63), insomnia (0.62), persistent fatigue (0.61), depression (0.56), sadness (0.49). The application of the methodology allows forming a monitoring system considering the scale of the pandemic impact and the psychological consequences. The mental distress caused by the COVID-19 pandemic has been shown to be characterized by such negative effects as anxiety, stress, insomnia, persistent fatigue, depression and persistent sadness. The study revealed that the major shortcomings in the system developed for localizing the negative effects are as follows: insufficient efforts of state institutions even in the case the negative effects are getting worse; inadequate provision of psychological assistance conditioned by unreasonably high prices and deficient legal framework.