Remember that there is a difference between services and the equipment that enables the services. (see section 1.4.1.1 - example services)
In FITS configuration management we identify and record all the component parts that make up the infrastructure (the pieces of equipment - hardware, software, documentation and so on).
In service level management we take a different view, determining what parts of the infrastructure are required to fulfil each particular service. This is a key step in improving communication between technical ICT staff and end-users. If you speak in terms of services and ensure that services are in working order, the end-user is receiving working ICT on their terms. To try to discuss end-user requirements in terms of the availability of file servers, routers, network cabling and so on would be undesirable, as it is unreasonable to expect end-users to understand the implications.
To document the services, you must then identify each service and the technical components of each service. Gathering service information is harder than doing an audit of physical equipment and is more likely to be in terms of what software is installed on computers and file servers. You will need to investigate every computer and file server and talk to at least one representative of each department to make sure that you don't miss anything. See section 2.2.1 - assigning roles and responsibilities in Service Level Management for further information on end-user representatives. Don't assume that if you haven't installed something yourself it doesn't exist!
To help you, we have prepared a service catalogue template (see the toolkit section for details) outlining the kind of information you should gather. Complete the section on service details with your service information: service details guidance available in the toolkit will help you do this. The section on service details in our service catalogue example should also help you understand what is required.
If you have implemented FITS Configuration Management, you should store your baseline service catalogue in the configuration management database. You should then ensure that the list is controlled and maintained so that it is always accurate and up to date (or you will have to do another audit). FITS change management can help you to do this.