Code Maintenance (Automated Testing, WYSIWYG Design, Templating, Build Tools, Continuous Integration Tools)
Learning Curve/Training (Current developer knowledge, Articles/Books, Third Party Training, Conferences)
Market Traction (Has a long history of use and code examples, Is being hyped now and has a bright future)
Development Agility (How likely we can do what we need to do, Modest and elegant programming paradigms, Robust and extensive libraries, Development tools, Active and strong developer community)
Cost (Open Source Community group, Open Source Big Company Support, Proprietary Framework)
Customer Acceptance (A development environment that will not surprise customers, Mainstream)
Security (Has all standard security fixes, Underlying libraries prevent vulnerability such as SQL Injection)
Ability to use automated testing (Designed to be tested, Easy to develop test scripts, Easy to incorporate test scripts into CI tools)
MY SUGGESTED CRITERIA