1. Tsim: Ib lub hnab ntawv yuav tsum muaj kev cuam tshuam cov ntaub ntawv ntawm cov khoom thiab lub tswv yim ntawm lub lag luam thiab hom.
2. Cov Lus Qhia Tshwj Xeeb: Cov hnab ntawv txawv ntawm lwm cov khoom, qhov tshwj xeeb ntawm lub hnab ntawv yog txiav txim siab los ntawm qhov loj ntawm cov khoom nruab, thiab cov lus qhia ntawm txhua lub hnab ntawv sib txawv.
3. Khoom siv: Cov ntaub ntawv ntawm lub hnab ntawv tuaj yeem xaiv cov ntawv dawb, kraft ntawv, ntawv tshwj xeeb, thiab lwm yam. Cov neeg siv khoom tuaj yeem xaiv raws li lawv qhov xav tau tiag tiag, vim tias txhua lub hnab ntawv muaj nws tus yam ntxwv.
4. Hom nqi: Thaum cov neeg siv khoom nqa cov hnab ntawv, qhov kev xav zoo li cas koj xav coj mus rau lwm tus yog txhua tus kis los ntawm cov hnab ntawv, yog li qhov chaw ntawm cov khoom lag luam tseem ceeb heev. Cov hnab ntawv yog ib hom kev tshaj tawm xov tooj ntawm tes, thiab kev siv zoo tuaj yeem nqa cov txiaj ntsig zoo heev.
