Generally, I believe I do.
Some teams do it in different ways but, for the Ravens, they have area scouts across the country looking into prospects and collecting personal reference information from college sources (coaches, trainers, admin, etc) while comparing that with their own opinions of the players talent and personality.
Throughout the year (or years) of research, they write reports and determine whether a prospect is worthwhile, 'draftable' is a word I've heard them use.
Eventually, all of these scouts (and guys like DeCosta, Hortiz, etc) reconvene and compile these players into a list. From there, I believe they go about grading and ranking these players with input from the coaches. I'm sure a few players get bumped off the list after further review. The 'final' product is the mythical big board.
From there, it's time for the draft where they weigh value with their selections, play the matching game of guessing who teams will pick, and turning their selections in.
They also have processes for self-scouting and scouting players on other teams but I know less about that because they discuss it less.
Am I ignorant to something with the scouting? I would like to know - because I am interested - and don't want to be clueless about it