Level of Service (also Service Level) can be defined as the service quality for a given activity. Levels of Service are often documented as a commitment to carry out a given action or actions within a specified time frame in response to an event or asset condition data.
The International Infrastructure Management Manual defines "Level of Service" as "the defined service quality for a particular activity (i.e. roading) or service area (i.e. streetlighting) against which service performance may be measured. Service levels usually relate to quality, quantity, reliability, responsiveness, environmental acceptability and cost."
Some Councils distinguish between different sorts of service levels, some of the common types are listed below.