In heterogeneous enterprise application environments, each application usually comes with different built-in security requirements and, consequently enterprise users are forced to remember multiple different passwords for various applications. Enterprise Single Sign-On (ESSO) solutions address this challenge by enabling users to access multiple enterprise applications using a single password for any kind of password protected application. This whitepaper offers a thorough checklist that should enable potential ESSO implementers to deploy the right ESSO solution which should help eliminate sign-on problems, reduce helpdesk costs, maximize user productivity, strengthen security, simplify administration and accelerate regulatory compliance.