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→Description: linkify free agent
[[Image:clusterMap.jpg|right|thumbnail|Map of the four clusters.]]
Currently, Williams upperclass housing is a "free agent" system. Students form groups of 4 and are assigned lottery numbers within their class. They then choose rooms on campus in order of lottery number.
Anchor housing restricts the room draw to a small cluster of dorms. Houses on campus will be divided into four clusters, each containing approximately six houses and one "anchor" house chosen to serve as the social hub of the cluster. Rising sophomores will form groups of six, and each group will be randomly assigned to a cluster. Upperclassmen will choose rooms in a lottery exclusive to their own cluster. Students remain in the same cluster throughout their time at Williams.