Using data on premarital couples who took PREPARE-ENRICH in 2006, about 40% of premarital couples had cohabited with their partner before marriage (Olson, 2007). This finding is based on a national sample of over 50,000 premarital coupleswho took PREPARE, PREPARE-MC and PREPARE-CC. The percentage of cohabiting couples varied by inventory: 100% for PREPARE-CC; 30% for PREPARE and 44% for those who took PREPARE-MC. The rate of 40% cohabiting with partner is lower than the national average of 58% because many couples taking PREPARE are married in a church setting and it is the first marriage for most of them. (Author abstract)