Lub tshuab ua haujlwm tsis siv neeg rau cov lag luam tuaj yeem tsim cov txiaj ntsig zoo dua, thiab ua lub luag haujlwm tseem ceeb hauv:
(1) Txhim kho kev nyab xeeb ntawm cov txheej txheem tsim khoom;
(2) Txhim kho kev ua haujlwm zoo;
(3) Txhim kho qhov zoo ntawm cov khoom;
(4) Txo kev siv cov khoom siv raw thiab lub zog hauv cov txheej txheem tsim khoom.