1. Nws muaj lub neej ntev kev pab cuam, zoo stability thiab zoo siab kuj.
2. Kev cuam tshuam zoo, tuaj yeem tiv thaiv sab nraud.
3. Nws tuaj yeem khoov arbitrarily thiab tsis yooj yim deformed thaum lub sij hawm tsim kho.
4. Kev tiv thaiv zoo rau qhov kub thiab txias thiab kev tsim kho yooj yim.
5. Kev ua haujlwm siab, kev teeb tsa yooj yim, kev saib xyuas yooj yim, kev tiv thaiv ib puag ncig thiab tsis muaj kuab paug.