Initial assessment stage sinp nominee to federal

Good day family :family_man_woman_boy: I submitted my application to cic on the 19th February 2019, got Aor on 17th April 2019. Got medical request on the 18th of July 2019 and got medical pass on 2nd of August 2019. I sent a web form later to know my application status and I was told that my application is currently in the initial assessment stage. I want to know what is done at the initial assessment stage. Thanks to everyone.