I implemented something like this for the uni I worked for a few years ago, basically we wanted to collect 'partials' as we called them. We were paying for web

I implemented something like this for the uni I worked for a few years ago, basically we wanted to collect 'partials' as we called them. We were paying for web campaigns and we wanted to increase lead intake by collecting information as fields were filled out. We attached this to a cookie that we assigned on user landing and as they typed in the input it was progressively building a profile. If you never clicked submit it was not considered a full lead and ended up in a partials database that got mined by the analytics group. Modern CMS's, specifically SiteCore have this kind of progressive profiling built in. It was one of the selling points for why we adopted it in our last rewrite.