While some informal interaction takes place, the first formal step in sorority recruitment is often an open forum of social mixers. Each sorority typically holds an open gathering where all new prospects come and meet current sisters. This step allows both sorority and prospects a chance for mutual learning. At some schools, this initial step actually takes the form of a single, large social gathering where all sororities and prospects intermingle.
The next phase, which the University of Michigan Greek life web page refers to as "preference parties," narrows the selection pool a bit. During this stage, new recruits narrow their pool of potential sororities to a handful of preferences. This decision allows for a more concentrated social experience where the recruits visit with and spend more time with each of their preferred options. The current sorority members can also get more familiar with the recruits.
The end of recruitment, or rush week, is typically known as "bid day." At this point the sororities extend bids to recruits that the sisters have decided would make good additions to the membership. Recruits may receive one or more bids. With multiple bids in hand, recruits must select the right sorority and accept the bid. This step normally concludes the recruiting process.
After rush week, most sororities have a formal welcoming day or process for new recruits. If all sisters live in a house, new recruits move into the house and a welcoming party and formal induction ceremony is often held. In other cases, freshmen don't live in a sorority house. The sorority may still hold a welcome ceremony at a house or in a separate on-campus location.