began to rotate into Avery, changing its status to a fully represented house. Also in 2005, work began on a major renovation project for the aging south houses, whose residents were relocated to a temporary modular housing complex. The renovations were completed at the beginning of the 2007 calendar year. Students moved back into the south houses on 15 December 2006, though construction continued through the beginning of 2007. Like most of the older buildings on campus, Avery House and the south houses are in California Mission style, and resemble cloistered monasteries with enclosed courtyards; the north houses are of Modern design. House memberships There are two ways to gain membership in a house: rotate in at the beginning of one's freshman year and become a full member, or become a social or full member afterwards. Procedures for admitting new members vary depending upon house bylaws and type of membership. Rotation Rotation is the process by which incoming freshmen choose (and are chosen by) the house they will be affiliated with. In Caltech parlance, freshmen are called "frosh" and are referred to as "prefrosh" until the revelation of their house affiliation at the end of rotation. Upon first arriving at Caltech, the incoming freshmen are given a random room assignment in a random house that is different from their Prefrosh Weekend assignment, and then spend a week eating mainly dinner and dessert in all of the houses, getting an opportunity to meet people in all of the houses. These meals and meetings are an opportunity both for the prefrosh to get to know the feel of the different houses and for the upperclassmen to meet and rate the prefrosh so both can see where they might belong. Many houses also show house-made videos to the prefrosh, which yield the prefrosh additional information about the various personalities of the houses. At the end of this week, the frosh rate each of the 8 houses in order of preference. Based on this, and the opinions of the houses' existing members, the prefrosh are placed into a house which will be their home physically and socially for the next few years. The Interhouse Committee attempts to ensure a certain level of secrecy regarding the exact process, so that the confidentiality of both the freshmen, and those involved with their final housing assignments, is maintained. Also, the selection process is constrained: there are only