Dot-walking is a concept within ServiceNow that enables you to drill down to records, as in the Filter UI. When you are in the List of Records modules page, you usually end up using the Filter UI. The Filter UI lists all columns in the table. Like the Incident table, it lists Number, short description, created date, caller, and so on. Suppose we want to list all incidents by a Caller named Joe Employee. Using the Filter UI, it is quite easy to do this - simply select the Caller field as one of the filters and set the search value as Joe Employee:

But what if we want to list records based on Callers who are from the sales department? We do not have a department field in the Incident table but we do have such a field in the user table. As we have learnt before in this chapter, the Caller field is of type reference and it is referring to a record in the users table. So, in order to list all Incidents of Callers who are from sales, we will employ a feature available in all Filter UIs called dot-walking: