Weighted Shortest Job First (WSJF) is a prioritization model used to sequence jobs (eg., Features, Capabilities, and Epics) to produce maximum economic benefit.
In SAFe (Scaled Agile Framework), WSJF is estimated as the Cost of Delay (CoD) divided by job size.
Agile Release Trains (ARTs) provide an ongoing, continuous flow of work that makes up the Enterprise’s incremental development effort. It avoids the overhead and delays caused by the start-stop-start nature of traditional projects, where authorizations and phase gates control the program and its economics.
While this continuous flow model speeds the delivery of value and keeps the system Lean, priorities must be updated continuously to provide the best economic outcomes. In a flow-based system, job sequencing, rather than theoretical, individual job return on investment, produces the best result.
To that end, WSJF is used to prioritize backlogs by calculating the relative CoD and job size (a proxy for the duration). Using WSJF at Program Increment boundaries continuously updates backlog priorities based on user and business value, time factors, risk, opportunity enablement, and effort. WSJF also conveniently and automatically ignores sunk costs, a fundamental principle of Lean economics.
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