Administrative assistants aim to please and are always trying to do things the way you want them. But if the way you want things done keeps changing, it becomes pretty impossible to hit a moving target.
"Don't keep changing the rules for answering your phone. Do you want me to interrupt you no matter what you are doing when you get a phone call no matter who it is? Or do you want me to use my judgment and know there are certain people you don't want to talk to or would prefer to call back later?" said one administrative assistant.
The point is, be consistent. And if you do want to change the way you do things, let your assistant know. Because while they’re good, telepathy and clairvoyance are not skills most people possess.