Lead and lag time

When sequencing activities and determining relationships, you may identify a need for either lead or lag time to be added to the relationship. Lead time condenses the overall duration, while lag time adds to it. There are some particular nuances to that statement, though. Lead and lag time do not add to costs, nor to resource schedules. If I am updating our data center and then installing the servers, I have a finish to start relationship. However, the servers will need to be delivered, and we may have to wait between the update and the install for that delivery. I will need to add some lag time between the update and the install. I'm not sure how your organization works, but I don't take kindly to paying people to stand around and wait for delivery people when they could be doing other things. Logically, though, that time needs to be there. Update data center = 4 hours, delivery time 4 days (lag), while installing servers = 3 hours. I only need resources...