The study analyzed class action cases filed between 2000-2006 in 12 California courts. It found that employment and business tort cases made up over half of all cases reviewed. Employment cases significantly increased over the period, while business tort cases declined after 2002. Contract cases also declined as a percentage of filings. Antitrust filings fluctuated greatly based on specific events - rising in 2000 due to energy crisis lawsuits and in 2003 due to auto industry suits. Overall, the nature of class action cases made traditional trend analysis difficult due to small case volumes and reactivity to events.