Chun ISO 9241-11 (1998)?L chun v Hng dn v tnh kh dng trong Yu cu cng thi hc i vi cc thit b u cui hin th trc quan. ISO 9241-11 xc nh tnh kh dng v gii thch cch lm th no xc nh cc thng tin cn thit khi c t v nh gi tnh kh dng ca thit b u cui v hiu nng v thoi mn yu cu ngi dung. Cc hng dn a ra cch m t cc ng cnh s dng, v bin php nh gi tnh kh dng. Cc hng dn ny c a ra dng nguyn l v k thut tng qut, ch khng phi l mt phng php no c th.Chun ny c s dng trong sn xut, thit k, pht trin, nh gi v giao tip cc thng tin v tnh kh dng; c p dng cho cc sn phm ng dng ni chung hoc c pht trin cho m t chc c th.

Chi tit v chun c th xem http://www.it.uu.se/edu/course/homepage/acsd/vt10/ISO9241part11.pdf M hnh Quality in Use Integrated Measurement (2006)?

Tnh kh dng ca phn mm l mt khi nim cht lng khng d dng o lng c. Thng thng, tnh kh dng phm mm c xem nh l tnh d s dng v d hc.QUIM c xut nh l mt m hnh xc nh, m hnh ha, nh lng, o lng cht lng trong s dng, bng tp cc yu t, chun, thang o v phng php v tnh kh dng t nhiu ngun da trn mt c s kin thc trung tm. QUIM gm c 10 yu t, 26 chun v 128 thang o nh gi cht lng phn mm. Nguyn l thit k ca NormanNguyn l thit k ca Norman gm:

Visibility can is see it? cng nhiu chc nng c th nhn thy c, th ngi dng cng bit r ci g s phi lm tip theo. Ngc li, khi cc chc nng khng r rng th rt kh tm v bit phi lm th no s dng. Feesback what is it doing now? thng tin phn hi v hot ng no hon thnh v c thc hin, cho php ngi dng tip tc thc hin cng vic tip theo. C nhiu loi phn hi, nh m thanh, xc gic, t ng hoc kt hp cc loi ny. V d: Hin th cc Dialog box khi c li xy ra. Thanh Progress bar dng hin th s phn trm hon thnh ca tin trnh. Affordance how do I use it? Dung ch thuc tnh ca i tng cho php ngi dung c th lm c g vi n. V d: cc Radio cho bit ngi dung ch chn mt la chn, cc Check box dng cho bit ngi dng chn nhiu la chn. Mapping where am I and where can I go? cp n mi quan h gia cc iu khin v cc hiu ng ca chng. V d: Trong mt ng dng c phn trang, v c cc nt mi tn Back v Next, trong khi cn xut hin mt trong hai nt ny th c ngha l ngi dng cha i n trang u tin hoc trang cui cng. Constraint why cant I do that? cp n rng buc trong cc tng tc ngi dung m c th din ra trong mt thi im. V d: trong ng dng son tho vn bn, khi m mt vn bn c sn, khi cha c thay i g, th nt Save khng c tc dng. Consistency this is familiar. cp n thit k giao din phi hot ng v s dng tng t nhau ca cc thnh phn tng t nhau i vi nhng nhim v nhau. V d: tt c cc button OK trong cng mt ng dng phi cng mt hnh dng, kch thc, v cng c chc nng l xc thc l ng mt tc v no .