## 3 Materials and Methods  
### Research Hypotheses and Aim  
Based on a literature review and previous research, questions were asked (described in more detail in the introduction section). These questions were the basis for establishing research hypotheses [1; 18; 19; 20]. These are based on previous studies' claims that big data in SCM impacts the performance of construction projects [20]. Some also specified key performance indicators such as time and cost [4; 6; 20; 21]. When analyzing the impacts in supply chain management, it is necessary to distinguish between construction time and materials delivery time. These are two views that are also discussed in this research. **Hypothesis 1**. : _Exploitation of big data concept and supply chain management shortens the delivery time of materials and services in sustainable building project._  
New information and communication technologies represent new possibilities in the management of the supply chain, as well. Ordering materials and services for construction can work in other than the traditional way. Inventory management can be time-consuming. Timing is an important aspect of managing construction projects. Timely delivery of construction materials can be an important step to the success of a construction project. Here is the assumption that the use of modern ICTs can affect the time of delivery of material. The use of hardware tools such as RFID sensors and components, cameras and other data collecting tools, and advanced supply chain information systems, especially analytical processing of large data, can positively affect material delivery time. **H\({}_{\bf 10}\). **_Exploitation of big data concept and supply chain management doesn't shorten the delivery time of materials and services in sustainable building project._  
**H\({}_{\bf 11}\). **_Exploitation of big data concept and supply chain management shortens the delivery time of materials and services in sustainable building project._  
**Hypothesis 2**. : _Exploitation of big data concept and supply chain management shortens construction time._  
This consideration assumes that the use of advanced technologies and the use of data analytics and the concept of big data can shorten the delivery of material, which can affect the shortening of construction time [6; 16; 31; 32]. If the first hypothesis is assumed, a high degree of correlation with the second hypothesis can be expected in this relationship. Construction time is an important parameter for all participants in a construction project. Many studies report this benefit of the big data concept in construction. So far, none of the available studies has examined exactly the real impact. **H\({}_{\bf 20}\). **_Exploitation of big data concept and supply chain management doesn't shorten construction time._  
**H\({}_{\bf 21}\). **_Exploitation of big data concept and supply chain management shortens construction time._  
**Hypothesis 3**. : _Exploitation of big data concept and supply chain reduces construction project cost._The idea that the use of big data concept in construction project management can also impact cost reduction is based on the considerations and statements of several authors who have conducted studies on big data. This is also a logical assumption when monitoring key performance indicators. In implementing this concept (several studies have confirmed that cost reduction may be a sufficient motivator for implementing BD and ICT [4; 32]), it could be one of the most important motivators. If the dependence between the use of BD in SCM and cost reduction is also demonstrated empirically, this can lead to faster implementation of these technologies. **H30. **_Exploitation of big data concept and supply chain management doesn't reduce construction project cost._  
**H31. **_Exploitation of big data concept and supply chain management reduces construction project cost._  
Since the established hypotheses focus on BD's impact in SCM on selected key performance indicators, namely on costs and time (also the basic parameters of CP).