Raws li tib neeg txoj kev noj qab haus huv thiab qib kev noj qab haus huv txuas ntxiv mus, ntau hom hnab tau dhau los ua cov khoom siv tseem ceeb. Cov neeg thov kom lub hnab tsis tsuas yog siv tau ntau dua tab sis kuj zoo nkauj dua.
Raws li kev hloov pauv cov neeg siv khoom nyiam, cov khoom siv lub hnab tau dhau los ua ntau yam. Lub hnab ntim tau kuj tau nthuav dav los ntawm cov hnab ntim khoom lag luam, hnab tsev kawm ntawv, thiab hnab mus ncig rau cov ntawv xaum, hnab nyiaj npib, thiab hnab me me. Cov nqi kuj nce ntxiv, thiab cov ntaub ntawv tau dhau los ua tshiab.
Ntau lub tsev kawm ntawv lub hnab ntim khoom tau pib tsom ntau dua rau kev nqa lub hnab tsev kawm ntawv, xav tias cov tub ntxhais kawm nqa ntau phau ntawv thiab ntau yam khoom siv hauv tsev kawm ntawv, ntau yam hnyav heev, ua rau cov tub ntxhais kawm nqa tau yooj yim. Cov hnab ntawv hauv tsev kawm ntawv yog qhov tseem ceeb, tab sis ntau lub hnab tsev kawm ntawv ntawm kev ua lag luam yog cov tsoos tsho, tshwj xeeb tshaj yog tsis muaj kev ntxhov siab thiab ua rau tawg. Ntau lub tsev kawm ntawv thiab cov niam txiv tau hais kom cov tuam txhab lag luam tsom mus rau kev txo qis thiab txhim kho kom zoo thaum tsim cov hnab tsev kawm ntawv.