Qhov tsim ntawm cov khoom lag luam suav nrog kev tshawb fawb cov khoom lag luam, kev npaj cov qauv, thiab ntim khoom. Cov hlwv hluav taws xob yog ib qeb hauv kev lag luam ntim kev lag luam, thiab nws tseem yog ib daim ntawv ntim uas koom nrog ntau yam ntawm kev sib tham.
Feem ntau, tom qab tau txais cov neeg siv khoom kev kos duab \/ kev tsim khoom, peb yuav npaj ua cov ntawv ua pov thawj. Nyob ntawm qhov nyuaj ntawm cov pwm, feem ntau nws yuav siv 3-5}} ua haujlwm hnub.
Tom qab cov neeg yuav khoom tau lees paub cov qauv loj, cov khoom siv, tuab, peb yuav npaj lub hlwv ntim, peb yuav siv cov pwm nyias nyias raws li kev txiav txim. Tag nrho yog {7-10} Cov khoom ua haujlwm tsis khoom, lossis cov khoom siv nyuaj rau txiav txim siab, nws yuav txuas ntxiv lub sijhawm nyob ntawm qhov xwm txheej.
