Assuming the solution-based, role-based, and filter checks pass, the final thing the validation service will do when performing a pre-validation activity is to call the validator associated with a UI component. As previously mentioned, a typical validator will contain pre-validation logic that is unique to a single UI component or a small set of related components. In other words, it is possible to associate a single validator with multiple UI components, if the validation logic is identical for those components. But in that case, you may also want to consider a filter. The advantage of using a filter is that you would always have the option to add a validator at a later time if the logic for one of the components deviates from the others.