What is a service level in SCM?

• A. A forecast error measure.
• B. A target performance metric that defines the acceptable probability of meeting customer demand on time.
• C. An inventory turnover ratio.
• D. A delivery speed measure.

Answer: (B)

Service level in supply chain management is a target performance metric that defines the acceptable probability of meeting customer demand on time. It sets how reliable you aim to be for fulfilling orders, guiding decisions about how much inventory to hold and when to reorder. For example, aiming for a 95% service level means you expect to meet on-time delivery in 95% of cases, accepting stockouts or delays in the remaining 5%. This concept directly influences safety stock and reorder points: higher service levels require more inventory to reduce the risk of stockouts, while lower service levels allow leaner stock.

It’s not about forecast accuracy, which is about how close forecasts are to actual demand, nor about how quickly inventory turns (inventory turnover), nor about the speed of delivery itself. Those other metrics measure different aspects of performance, whereas service level focuses on the reliability of meeting demand on time.