## 1 Introduction  
Building Information Modeling (BIM) is \"the process of generating, storing, managing, exchanging and sharing building information in an interoperable and reusable way\" [1] with the use of BIM models. Construction project execution using BIM can bring measurable benefits in the form of lower costs over a building's life cycle [2, 3, 4], a shorter construction completion time due to less design errors [5, 6] and less wastefulness [7]. A report by the Boston Consulting Group suggests that by 2025, due to the application of a wide-ranging digitalization process, yearly global savings during the design, engineering and construction stages will amount to 13-21%, and savings during the operation phase will amount to 10-17% [8]. Some countries have introduced programs and government regulations on BIM implementation, thereby encouraging developers to adopt it [9]. In some countries, BIM implementation is highly developed, while in others it is only starting to be introduced [4, 10, 11, 12, 13, 14]. In Poland, projects that utilize BIM, especially during the construction phase [15], are relatively uncommon, yet their number is expected to increase [16]. Education in BIM contributes to the construction sector's productivity [17]. The results of surveys among students encourage the mandatory teaching of BIM [18]. Due to the benefitsof education in BIM, certain universities have incorporated it into their curricula [19; 20; 21]. The number of research papers and presentations delivered at national and international conferences dedicated to BIM is growing [22; 23]. To investors, the availability of BIM tools [24; 25; 26], including data exchange platforms between stakeholders, called Common Date Environment CDE [27; 28], integrated management principles based on BIM models in the building [29; 30; 31], case studies (e.g., [32; 33; 34]) and execution standards [9; 35; 36] can facilitate starting a project using BIM. As stipulated in the ISO 19650 standard [37], in the context of information management, a building's life cycle consists of three essential parts: Organizational Management, e.g., following ISO 9001, Asset and Project Management following ISO 55000 [38] and ISO 21500 [39], and Information Management following ISO 19650 [37]. The last of these phases consists of a cycle between the Delivery Phase PIM and the Operational Phase AIM, which ensures that information obtained during project execution is used during the building's operation. During the first stage of real estate development, the developer should formulate organizational goals and requirements, and specify what information they will require from other project participants. These guidelines, which are made available to stakeholders, are called Exchange Information Requirements or Employer's Information Requirements, and concern information exchange while accounting for the Ordering Party's goals, execution standards, processes and what is expected of project participants. They can also describe the manner of delivering documentation and its content. The Requirements are an essential document in the development process. Their highly precise formulation is crucial, as it determines what will be required later so as to avoid disappointment with the end result [40].  
The correct formulation of the Employer's Information Requirements is difficult and complex [34; 41; 42]. The aim of our research is analysis of Employer's Information Requirements as based on selected large construction projects from Poland. The objective of the study was to facilitate EIR formulation for future construction projects using BIM.