What document may be required as part of the WCB pre-qualification process?

The document that may be required as part of the Workers' Compensation Board (WCB) pre-qualification process is coverage. This refers to proof of workers' compensation coverage for employees working on a construction site, which is essential for ensuring that all workers are insured in case of workplace injuries or illnesses.

Having valid workers' compensation coverage is crucial for companies to participate in construction projects, as it demonstrates their commitment to employee safety and regulatory compliance. Proper coverage protects both the workers and the employer from potential liabilities.

While the other options like a Quality Assurance Report, Contractor Invoicing, and Client Feedback can be important in other aspects of project management and quality control, they do not specifically pertain to the pre-qualification requirement as related to workers' compensation. Therefore, coverage stands out as the primary focus during the WCB pre-qualification process.