This will enable students to talk out their ideas and organize their thoughts. Having someone listen and provide feedback is important when trying to weigh options. An advisor from an academic unit can answer specific questions that a student who is interested in that unit may have. On the other hand, a UUD advisor can offer an unbiased view for someone who is interested in many different areas. Friends, Family, Professors, etc.
Outsiders can provide a somewhat less biased evaluation of that student and offer new perceptions.
Doing a keyword search from a search engine will turn up many helpful sites. These and other assessments can give further guidance regarding self-assessment.