Service-based ALS – Here, an ALS covers a service for all customers of that service – for example, an ALS can be created for the e-mail service of an organization that covers all customers of that service. This may seem quite simple. A difficulty that sometimes happens is that employees at different levels within the client community may have different goals and perceptions. For example, an executive can rarely use a service and be more interested in topics such as value for money and performance, while a junior employee can use the service throughout the day and perhaps focus more on topics such as responsiveness, ease of use and reliability. Define, negotiate, document and agree requirements for new or modified LRCs, as well as their management and verification of service lifecycle in ATS for operational services. However, difficulties may arise if the specific requirements of different customers vary for the same service or if the characteristics of the infrastructure make different levels of service unavoidable (for example.B. can be connected by a local broadband network. , while local offices may have to use a WAN line at a lower speed).