SumAll.org, a nonprofit dedicated to using data for social good, SumAll is helping New York City and nonprofit organization CAMBAcombat homelessness in a pilot program. Eviction notices are among the primary signifiers that a family is about to become homeless — though not all evictions lead to homelessness. About 200,000 households get evicted in New York City each year. In big data terms that's not an exceptionally large number of records. But identifying which of those 200,000 are most at risk of becoming homeless as a result of eviction proceedings is a challenge.