Public finances are a term used to denote specific financial relations and operations taking place within the economic system between public administration institutions, on the one hand, and other entities, on the other. From an economic point of view, a public contract means an efficient allocation of resources with the aim of material and material provision of public administration bodies with such services that these bodies cannot or do not want to secure themselves. Through public procurement, a relatively high volume of public spending is realized in each developed country. Public procurement of goods, services and works by public institutions currently accounts for a relatively high percentage of GDP, estimated at more than 15% in the economies of Central and Eastern Europe. The area of procurement is one of the key areas where the public and private sectors interact financially with each other. As part of the paper, we primarily deal with below-limit and above-limit contracts in public procurement in the Slovak Republic. As part of the research, we focused on the period from 2016 to 2019. The paper provides an overview of the number of procedures in public procurement for the period from 2016 to 2019. In this comparison of data, we try to demonstrate the strength of public procurement in the public sector as well as the volume of financial flows spent on procurement. Within the issue of our research, the acquisition of relevant documents as well as verified procedures is very problematic, as we do not have a significant number of sources of professional and science publications related to these topics in the Slovak Republic.

The aim of the article is to propose the combination of selected quality management instruments in a sequential and repetitive manner and to identify the incompatibilities and causes of its occurrence. This is a combination of techniques i.e.: brainstorming (BM), causes and effects diagram, multiply voting, and the 5Why method. The test of the proposed combination of the selected quality management instruments was made for the problem of the incompatibility of the product in an enterprise located in the Podkarpacie. This problem was the non-metallic inclusions on the bearing housing from CPW 407 steel. The proposed combination of the selected quality management instruments was integrated with the non-destructive testing (NDT). The originality of the study is to propose the combination of selected quality management instruments as a part of a single method, whose stages can occur in a sequential and repetitive manner.

Predicting favourable products is still challenging. It is influenced by dynamic customers' requirement changes and reduction of waste. An important problem is a simultaneous combination of customer satisfaction with environmental aspects. It resulted from a need to reduce the harmfulness of products and increasing the quality level of these products. Therefore, the aim is to propose a method to predict favourable products considering qualitative and environmental aspects. The method relies on predicting which product will be the most favourable for customer, and simultaneously will be the most environmentally friendly. Due to the uncertainty of decisions, the Grey Relational Analysis (GRA) was implemented in the proposed method. The GRA method is effective to any number of data, therefore the proposed method does not have limitations in numbers of qualitative and environmental criteria. The test was carried out based on harmful industrial products. It was fluorescent penetrants used in popular non-destructive testing.