Mass appraisal is the process of valuing many properties simultaneously using standardized methods, statistical models, and computerized analysis rather than individual property inspections. Provincial assessment authorities use mass appraisal to efficiently value hundreds of thousands of properties for taxation purposes. The process involves analyzing sales data, developing valuation models based on property characteristics (size, location, age, features), and applying these models consistently across all properties. Mass appraisal produces generally accurate valuations cost-effectively, though individual properties may require review. Property owners who believe mass appraisal produced an incorrect value can request reviews or file assessment appeals.