## 3 Hypothesis Development
\begin{table}
\begin{tabular}{p{56.9 pt} p{113.8 pt} p{113.8 pt} p{113.8 pt}} \hline \hline  & **Construct** & **Code** & **Definition** \\ \hline \multirow{3}{*}{**Second Order**} & Construction supply chain integration & CSCI & The degree to which a focal construction organization has integrated its upstream and downstream and reverse logistics partners along the supply chain. \\ \multirow{3}{*}{**First Order**} & Backward integration & BI & The degree to which a focal construction organization takes measures with its upstream partners to guarantee and manage production, transportation, and construction activities. \\ \multirow{3}{*}{Forward integration} & \multirow{3}{*}{FI} & The degree to which a focal construction organization takes measures with its downstream partners to access end-markets. \\ \multirow{3}{*}{Reverse logistics} & \multirow{3}{*}{RL} & The extent of the material circulation from the point of consumption, i.e., construction sites to the point of origin, i.e., material markets and salvaged buildings. \\ \multirow{3}{*}{**Second Order**} & Sustainable use of construction material & SUCM & The extent of improving the efficient use of construction materials, minimizing waste generation, and creating channels to transform waste into the material resource. \\ \multirow{3}{*}{**First Order**} & BMCC environmental design & BED & The extent of source control and material optimization through design, to set up environmental targets and find alternatives to non-renewable resources. \\ \multirow{3}{*}{Material and consumption} & \multirow{3}{*}{MPC} & The extent of process control and material using regulation, including accurate material quantity estimation, green procurement, and appropriate material use strategies. \\ \multirow{3}{*}{C\&D waste sustainable treatment} & \multirow{3}{*}{CST} & The extent of re-using and recycling construction and demolition waste with corresponding regulations, standards, and technologies. \\ \multirow{3}{*}{} & \multirow{3}{*}{MSC} & \multirow{3}{*}{MSC} & The extent of re-using and recycling construction and demolition waste with corresponding regulations, standards, and technologies. \\ \cline{1-1} \cline{3-3}  & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Definition of research constructs. Figure 2: Initial research model. According to the research framework and research model, the hypothesis about higher-order constructs that SUCM is positively correlated with CSCI is proposed as H1. Meanwhile, there are a series of hypotheses, i.e., H2 to H7 between the first order constructs and their higher-order construct. The following set of hypotheses (labeled as H1-H7) is proposed:  
**Hypothesis 1 (H1). **_High degree of the construction supply chain integration is likely to improve sustainable use of construction materials._  
**Hypothesis 2 (H2). **_High degree of the backward integration is likely to enhance construction supply chain integration._  
**Hypothesis 3 (H3). **_High degree of the forward integration is likely to enhance construction supply chain integration._  
**Hypothesis 4 (H4). **_High degree of the reverse logistics application is likely to enhance construction supply chain integration._  
**Hypothesis 5 (H5). **_The sustainable use of construction material is positively associated with BMCC environmental design._  
**Hypothesis 6 (H6). **_The sustainable use of construction material is positively associated with material procurement and consumption._  
**Hypothesis 7 (H7). **_The sustainable use of construction material is positively associated with C&D waste sustainable treatment._