This IBM® RedpaperTM publication covers the detailed step-by-step installation of IBM Tivoli® Access Manager for Enterprise Single Sign-On 8.1 onto a single-server and a clustered environment. This paper supplements the IBM Tivoli Access Manager for Enterprise Single Sign-On 8.1 Installation Guide and IBM Tivoli Access Manager for Enterprise Single Sign-On 8.1 Setup Guide. Do not use this document in isolation. Check the relevant guides in the Tivoli Access Manager for Enterprise Single Sign-On Information Center as you perform the install. There might be various reasons to install Tivoli Access Manager for Enterprise Single Sign-On into either a single server or a clustered environment. A small-scale deployment, a typical proof of technology, or a proof of concept might be the best examples for a single server installation, whereas larger scale deployments or requirements for high availability and scalability might be reasons to deploy in a clustered environment. This IBM Redpaper is targeted towards administrators and engineers who are facing a Tivoli Access Manager for Enterprise Single Sign-On deployment on either a single IBM WebSphere Application Server or a clustered IBM WebSphere Application Server Network Deployment configuration.