Before you can dive into any kind of advanced customer behavior analysis, you have to make sure you're counting each user once and only once. This is a surprisingly difficult problem, especially with customer touchpoints across devices. To accurately measure your users, you have to tie identities across anonymous and logged-in sessions, account for when people change their email addresses, and plan for cross-platform interactions. In this webinar, Erin Franz, data analyst from Looker, and Will Johnson, Success Lead at Segment, share signals that you are miscalculating your users and methods for creating a universal user ID. You can view the webinar at http://www.looker.com/video/identifying-users-with-universal-id