A Strategic Service Level is a service level concerned with customer outcomes but also relates to how an organisation (i.e. council) describes these services. One instance could be Community Service Level, but it is difficult to find an authoritative definition of this term.
Another example of strategic service levels applies within the organisation, chartered with delivering the service. This can be described as the services to be delivered to external customers (from an internal perspective). This is sometimes referred to as Operational Service Level but is often defined in the Service Quality Specification.
Both service levels above (external or internal looking) require a means of monitoring and controlling the service level delivery. This controlling mechanism is referred to as a Service level Agreement