9. Poor contractor or subcontractor performance: If contractors or subcontractors do not meet expectations or fail to deliver on time, it can disrupt the construction process and result in delays and compromised quality. 10. Inadequate quality control: Failure to implement proper quality control measures can lead to construction defects, safety hazards, and the need for costly rework or repairs. It is essential to address these factors proactively through effective planning, communication, risk management, and supervision to minimize the chances of construction projects going wrong.