Supplemental Material for "From Bid Design to Delivery: How Evaluation Ambiguity Drives Variation Costs in Road Projects"

This dataset contains supplementary tables, Barrier–Evidence matrices, methodological workflow summaries, and statistical outputs supporting the manuscript entitled “From Bid Design to Delivery: How Evaluation Ambiguity Drives Variation Costs in Road Projects,” submitted to the Journal of Construction Engineering and Management. The materials include:• Table S1. Barrier–Evidence Matrix (60 candidate barriers)• Table S2. Hierarchical regression outputs• Table S3. Research methodology workflow summary• Supplementary methodological and statistical materials supporting replication and transparency.