sr xprnc vltn (X) r sr xprnc ssssmnt (X) rfrs t cllctn f mthds, sklls nd tls tlzd t ncvr hw prsn prcvs systm (prdct, srvc, nn-cmmrcl tm, r cmbntn f thm) bfr, drng nd ftr ntrctng wth t. t s nn-trvl t ssss sr xprnc snc sr xprnc s sbjctv, cntxt-dpndnt nd dynmc vr tm. Fr X stdy t b sccssfl, th rsrchr hs t slct th rght dmnsns, cnstrcts, nd mthds nd trgt th rsrch fr th spcfc r f ntrst sch s gm, trnsprttn, mbl, tc.