Crystal is an agile software development methodology that focuses on frequent delivery of software, reflective improvement of processes, direct communication, personal safety, focus, access to expert users, and agile engineering practices like test-driven development and continuous integration. It aims to be the "sloppiest methodology that can possibly work" by keeping things simple with an emphasis on individuals and interactions over rigid processes and tools.

1. Crystal Agile Methodology Alistair Cockburn

2. What is Agile? agile |ˈajəl| adjective able to move quickly and easily : Ruth was as agile as a monkey | figurative his vague manner concealed an agile mind.

3. How is Crystal different? “ Sloppiest methodology that can possibly work.” - Martin Fowler

4. One. Frequent Delivery of Software

5. Two. Reflective improvement of processes

6. Three. Osmotic or direct communication

7. Four. Personal Safety

8. Five. Focus

9. Six. Access To expert user

10. Seven. Agile Engineering Practices TDD, Continuous Integration

11. K eep I t S tupid S imple "Individuals and interactions over processes and tools" – Agile Manifesto

12. Training