This is perhaps one of the most important yet challenging questions in all of IT Service Management. In fact it makes ITSM possible (given the realization that it is IT Service Management). I pondered this question while having lunch and catching up on some industry reading about value and customers. The ITIL© V3 definition of a service is as follows: A service is a means of delivering value to customers by facilitating outcomes customers want to achieve without the ownership of specific costs and risks. So given this definition, how do we know what exactly is a service? As a result of my pondering (and some sauce spilled on my blazer from my lunch) I came to a conclusion. Simply, a service is anything you do to help other people accomplish a goal. In other words it is “work done for other people”. If a person could accomplish the work themselves, would they need service provided to them? Maybe, but often, they can’t do it as well, as cheaply, etc. As an example, let’s go back to the s...