The service provider
To answer questions such as:
- How many people are using the service or the product?
- Why do some people use the service/product while others do not?
- How effective is the service/product?
- How can the service/product be improved?
- Which type of people use or do not use the service/product?
- How satisfied or dissatisfied are the consumers of the service/product?
- What are the problems with the service/product?