Service level describes, usually, in measurable terms, the services a network service provider furnishes a customer within a given time period. When used as a call center metric, service level measures the percentage of incoming calls that an agent answers live in an established amount of time.
In the supply chain, the cycle service level (or just service level) is the expected probability of not hitting a stock-out during the next replenishment cycle, and thus, it is also the probability of not losing sales. … This trade-off is precisely measured through the notion of service level.
Customer service level is the percentage of occasions on which the order is delivered as promised. It is a set of rules and strategies put forth to evaluate the performance of a system. We can determine the satisfaction of the customers it deals with, and how much more of an effort it needs to make.
There are basically four clearly defined levels of customer satisfaction. Each level is based on the degree to which your business is meeting customer expectations. The higher the level that your business is able to achieve than the more you will build customer loyalty which will support greater success.