Scheduling Theory (Earliest Due Date, Weighted Shortest Job First)

The mathematical study of optimal task sequencing under different objectives. Shortest Job First minimizes average wait time (do quick tasks first). Earliest Due Date minimizes late deliveries (do urgent tasks first). Weighted Shortest Job First (WSJF) maximizes total value delivered by prioritizing tasks with the highest ratio of value to duration—the most value per unit of time. WSJF is the most useful for knowledge work: it asks not just 'what's urgent?' or 'what's quick?' but 'what delivers the most value for the time invested?'

When to use it

When task backlog is growing and prioritization is unclear; when you're torn between high-value slow tasks and quick low-value tasks; when team capacity is limited and sequencing directly affects total value delivered; when designing sprint planning or backlog prioritization processes.

How it can help

Apply WSJF to your task backlog: for each task, estimate its value (impact if done) and its duration (effort to complete). Divide value by duration to get the WSJF score. Do the highest-scored tasks first. This simple calculation consistently outperforms intuitive prioritization because it prevents the two most common errors: doing high-value but enormous tasks first (blocking everything else) and doing quick but low-value tasks first (staying busy without impact). WSJF optimizes for total value delivered over time.