Part 1 and Part 2 of application

Why MIT allows sending Part 1 and Part 2 of application separately instead of sending complete application?

Some areas of the world receive so many applications that MIT, at times, likes to make sure if candidates are serious about applying. Accordingly, MIT requires them to submit Part 1 before assigning applicants interviewers. If you haven’t heard about this, don’t sweat it. Just get everything in by November 1st.

Thank you @Newdle . I didn’t know about this. I was planning to submit both parts together. I have my interview scheduled already.