Thaum peb tsim cov hnab ntawv kraft, peb yuav tsum xav txog qhov ua tau zoo, kev zoo nkauj thiab kev tiv thaiv ib puag ncig. Nyob rau hauv cov nqe lus ntawm practicality, nws yog tsim nyog los xyuas kom meej tias qhov luaj li cas thiab load-bearing muaj peev xwm ntawm kraft ntawv hnab ua tau raws li cov kev xav tau ntawm cov neeg siv khoom; Hais txog kev zoo nkauj, cov ntsiab lus tsim qauv yooj yim lossis muaj tswv yim tuaj yeem siv los qhia cov yam ntxwv ntawm hom; Hais txog kev tiv thaiv ib puag ncig, ib puag ncig tus phooj ywg cov ntaub ntawv luam tawm thiab cov txheej txheem yuav tsum raug xaiv los cuam tshuam lub tuam txhab lub tswv yim ntsuab. Los ntawm kev ua tib zoo tsim, ntim cov tuam txhab tsim khoom tuaj yeem tsim cov hnab ntawv kraft thiab zoo nkauj kom yeej qhov kev nyiam ntawm cov neeg siv khoom.