What Kind of Approach is required for Technical Trouble shooting in an I.T Environment apart from Practical And Analytical Approach ?

Two terms Practial and Anlytical covers most of it but I think other approaches may differ considering each individual and the situation they face. I'd also consider following generally:

1. Understand Environment

2. Entertain every possibility

You may have a look at these links:

http://cygnus.cc.ncu.edu.tw/netflow/juniper/swcmdref/strategies2.html

http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1901.html

http://serverfault.com/questions/8812/your-troubleshooting-rules-approach-to-troubleshooting

Please educate me if you can!