Cost of Delay
The economic impact of postponing a decision or action, quantifying the value lost per unit of time a task remains undone.
Also known as: CoD, Time cost of delay, Delay cost, WSJF
Category: Decision Science
Tags: decision-making, prioritization, productivity, economics, strategies
Explanation
Cost of Delay (CoD) is a concept from lean product development that quantifies the economic impact of not doing something now. It answers the question: 'What is it costing us to wait?' By putting a number on delay, it transforms vague urgency into concrete prioritization.
The concept was popularized by Don Reinertsen in his work on product development flow. He argued that most organizations are terrible at prioritization because they focus on the cost of doing things (effort, resources) while ignoring the cost of not doing them (lost revenue, missed opportunities, compounding problems). Cost of Delay captures the time-value of work.
CoD is particularly powerful when combined with effort estimates to calculate CD3 (Cost of Delay Divided by Duration) - also known as Weighted Shortest Job First (WSJF). This metric helps identify which items should be done first: those with the highest cost of delay relative to their implementation time. This naturally surfaces low-hanging fruit - items that are quick to do and expensive to delay.
In personal productivity, cost of delay thinking helps overcome procrastination by making the consequences of inaction tangible. A task that seems low-priority today may have a compounding cost of delay: unfiled taxes incur penalties, unaddressed health issues worsen, delayed learning means years of lower capability. Recognizing these hidden costs can shift priorities dramatically.
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