Expertise is knowing what to do and how. It yields consistent, effective results.
Expertise involves determining the relevance of certain data, processes, or actions, emphasizing certain rules that help to get good results, knowing when to break the rules, and explaining why certain results are better than others.
An expert knows the domain-specific details, concepts, habits, and attitudes that make up good thinking and results-oriented performance.
If someone asks about your job, where you are in the process of a project, or needs to do one of your tasks while you’re not there, the details (processes) will have been recorded so a sufficient amount of information is available to eliminate confusion, errors, and ambiguity.
If someone is out of the office, you’ll know what to do in order to save yourself time and hassles.