This document provides an overview of ASP.NET Identity and how it relates to OWIN and Katana. It begins with a brief history of previous ASP.NET membership systems like ASP.NET Membership and their limitations. It then introduces ASP.NET Identity as the next generation membership system, describing how it enables ease of plugging in profile data, persistence control, and OWIN integration. It provides an introduction to OWIN as an open specification for .NET web applications and servers to communicate. Katana is introduced as an OWIN implementation for Microsoft servers and frameworks. The document concludes with an agenda for live demos of ASP.NET Identity, consuming its API, and writing custom OWIN middleware.