PASS yog sau ib kab rau ob peb zaug, sau ntau zaus nws sau, zoo dua qhov qub. Piv txwv, 3PASS yog ib txoj kab luam tawm rau 3 zaug. Muaj pes tsawg tus PASS nws siv los luam tawm yuav to taub raws li daim duab uas luam tawm rau pes tsawg lub sij hawm, uas yog hais txog seb muaj pes tsawg daim npav taub hau yuav muab faib ua, overlapping coverage, qhov loj dua PASS, qhov zoo dua qhov teebmeem. Vim tias cov ntaub ntawv yuav absorb ink number hauv lwm lub sij hawm, cov nyhuv yuav ntau dua ilv, nws yuav faib rau ob peb kis nyob hauv tib lub rooj, uas yog hais qhov daws ntawm cov nyhuv tawm tsis muaj kev sib raug zoo rau cov pass, tsuas zoo theem yuav zoo dua.Piv txwv li, ib daim duab nrog ob tug PASS tso tawm, lub taub hau luam raug muab faib ua ob ntu los npog cov duab.
