This document classifies services based on four key dimensions:
1. The nature of the service act, which can involve tangible or intangible actions directed at people or things.
2. The type of relationship between the service organization and its customers, which can be either a membership relationship with continuous delivery or discrete transactions with no formal relationship.
3. The scope for customization and judgment in delivery, which can be high with customized service or low with standardized service.
4. The nature of demand, which can have wide fluctuations in peak demand that may or may not be easily met, or narrow fluctuations.