A key part of a lot of system administrators, and IT managers roles, is organising and ensuring a top quality service to their customers. For a lot of customers, the most visible part of the IT department is actually the service desk. This is supported in "The practice of system and network Administration" by Thomas A. Limoncelli, Christina J. Hogan and Strata R. Chalup."The practice of system and network Administration" by Thomas A. Limoncelli, Christina J. Hogan and Strata R. Chalup.
In some ways a customer will react more negatively to a bad service desk experience then to a service outage. However, once you have the basics of a service desk covered, a lot of it comes down to people management, and this is beyond the scope of serverfault. If the question is regarding how to best respond to a particular type of issue it is more likely to be on topic, but a question regarding the best method of making sure two junior admins are sharing work equally and responsibly is out of scope, and better answered at an alternate location.