The document discusses and critiques 8 different definitions of services:
1. Negative approach (all that's not a product)
2. Service as a process
3. Service as an outcome of a process
4. Service as a contact-intensive product
5. "Service-Dominant Logic" (everything is a service)
6. "IHIP" properties (intangibility, heterogeneity, inseparability, perishability)
7. No change in ownership rights
8. Customer input into the production process
While each definition provides some insight, they all have limitations in fully describing what a service is. A unified definition that incorporates the customer experience may be needed.