## 2 Methods
### Launching an Expert Survey  
Analysis of the sources, written by foreign and Russian experts, helped to identify the main parameters influencing the quality of a construction product at different stages of its lifecycle:  
Initial permits (IP). Engineering surveys. Project documentation (PD). * Corporate structure. * Equipment and materials used. * Construction and installation works. * Executive and other documents that need to be issued in order to put the facility into operation, to undergo an examination for compliance with approved standards [29; 30; 31]. The research work was divided into two phases: the first identified groups of factors that could have a great impact on the quality of high-rise residential buildings, while the second evaluated the impact of each factor considered separately; how they interact with and influence each other. The use of the expert survey method allowed the authors to obtain initial information for the first phase of the study; hence, only those factors which had a strong impact on the quality of high-rise residential buildings were considered. The expert survey was launched among construction industry specialists; 113 experts participated in the selection procedure pursuant to the competence requirements applied to each expert [32]. The authors selected professional experts who had the necessary qualifications and experience in this area. They included directors of construction enterprises, professional builders experienced in the construction of various purpose buildings; chief engineers of construction companies, engaged in design and quality control (the register of builders is available on the NOSTROI (National Association of Builders) website, and the register of designers and surveyors is maintained by the National Association of Designers and Surveyors). Initially, each expert was asked to give a yes/no answer to the question as to whether any of the factors considered by the authors had any impact on the quality of a multi-storey residential building. After studying and analyzing the research literature, the authors concluded that, of all the factors studied, the quality and safety of the construction of multi-storey residential buildings were most influenced by the following characteristics:  
* Engineering specifications for construction facilities (\(P_{1}\));
* Reliable and sufficient pre-construction surveying reports (reports on engineering-geodesic, engineering-geological, engineering-ecological, engineering-hydrological surveys, etc.) (\(P_{2}\));
* Compliance of design solutions with the requirements of construction regulations, state standards, and other regulatory documents in effect at the time of the building examination (\(P_{3}\));
* Full compliance of materials and equipment with regulatory and design documentation requirements (\(P_{4}\))
* Compliance with administrative and engineering solutions (\(P_{5}\));
* Compliance with the sequence of works (\(P_{6}\));
* Geotechnical monitoring (\(P_{7}\));
* Availability of hoisting machinery (\(P_{8}\));
* Number of employees, including specialists, with sufficient work experience and appropriate qualifications (\(P_{9}\));
* Application of industrial formwork systems (\(P_{10}\));
* Application of advanced engineering machinery (\(P_{11}\)) [33]. The expert survey method enabled the authors to identify indexes of importance of duly selected parameters, and they consequently decided to choose the widely spread method known as ranking (or the questionnaire method) (Table 1). The questionnaire was compiled with due regard for all the features of the construction industry [34; 35; 36]. In the process of studying the questions and completing the questionnaire, each of the experts was instructed to assign a score of 1 to 11 to each factor to identify their significance and establish their impact on the quality of work. The expert questionnaire enabled the identification of the eight most significant factors.