Objective - The objective of this study is to examine the impact of the environment uncertainty, predominantly from two factors which are supply uncertainty and design change in the relation between SCI and the supplier's performance in the construction sector.

Methodology/Technique - The methodology used, was based on a case study of an Indonesian construction company, with its connection to its suppliers. Data collected in this study included questioners and regression analyses to test the hypotheses.

Findings - The empirical results show that SCI has a positive effect on the supplier's performance. The positive SCI-performance relation will be weakened by supply uncertainty, but will be strengthend by the change or modification in the construction design.

Novelty - This findings will provide better understanding, of environmental uncertainty in term of supply uncertainty and design change in the SCI-performance relationship, therefore this study will provide a valuable contribution to the SCI theory.

Type of Paper - Conceptual

Keywords: Supply uncertainty, construction design change, Construction Company, supply chain Integration, performance.