The NASS application (which later becomes the Preliminary Application after NASS apps are closed) serves as an important "screener" that allows Admissions to determine whether an applicant qualifies to become a Candidate. If so, the applicant is granted a Candidate number and credentials for logging into the Candidate Information System. Once logged in, the Candidate begins an in-depth battery of questions including academics, athletics, ECAs, Math and English teacher evaluations, and a Personal Statement. The NASS/Prelim App also serves as a trigger for BGOs to make initial contact to schedule an interview or consult and consul an applicant to improve their test scores in order to hopefully receive a candidate number and move forward in the app process. I hope this helps!