The document discusses cost of delay (CoD), which is a method for prioritizing tasks by calculating the cost or loss of value from delayed delivery. CoD is determined by considering factors like user business value, time criticality, risk reduction, and opportunity enablement. The weighted shortest job first (WSJF) method uses CoD and job size to prioritize tasks, with the highest priority given to tasks with the highest CoD relative to job size. An example exercise is provided to calculate CoD and WSJF scores for different tasks to determine priority.