This document discusses how big data and artificial intelligence can assist with legal decision making. It begins by quoting Oliver Wendell Holmes Jr. on using data to predict outcomes. It then discusses websites that crowdsource Supreme Court predictions, and how data from many players can provide insights. Next, it introduces companies using big data to assist lawyers and analyze legal information. The document envisions AI assistants that can help non-lawyers understand legal options and draft basic documents. In the future, intelligent systems may assist with litigation. However, many ethical, legal and regulatory issues still need to be addressed as data and AI increasingly impact the legal field.