Blm's txnmy s frmwrk fr ctgrzng dctnl gls, dvlpd by cmmtt f dctrs chrd by Bnjmn Blm n 1956. t ws frst ntrdcd n th pblctn Txnmy f dctnl bjctvs: Th Clssfctn f dctnl Gls. Th txnmy dvds lrnng bjctvs nt thr brd dmns: cgntv (knwldg-bsd), ffctv (mtn-bsd), nd psychmtr (ctn-bsd), ch wth hrrchy f sklls nd blts. Ths dmns r sd by dctrs t strctr crrcl, ssssmnts, nd tchng mthds t fstr dffrnt typs f lrnng.
Th cgntv dmn, th mst wdly rcgnzd cmpnnt f th txnmy, ws rgnlly dvdd nt sx lvls: Knwldg, Cmprhnsn, pplctn, nlyss, Synthss, nd vltn. n 2001, ths txnmy ws rvsd, rnmng nd rrdrng th lvls s Rmmbr, ndrstnd, pply, nlyz, vlt, nd Crt. Ths dmn fcss n ntllctl sklls nd th dvlpmnt f crtcl thnkng nd prblm-slvng blts.
Th ffctv dmn ddrsss tttds, mtns, nd flngs, mvng frm bsc wrnss nd rspnsvnss t mr cmplx vls nd blfs. Ths dmn tlns fv lvls: Rcvng, Rspndng, Vlng, rgnzng, nd Chrctrzng.
Th psychmtr dmn, lss lbrtd by Blm's rgnl tm, prtns t physcl sklls nd th s f mtr fnctns. Sbsqnt dctrs, sch s lzbth Smpsn, frthr dvlpd ths dmn, tlnng lvls f skll cqstn frm smpl prcptns t th rgntn f nw mvmnts.
Blm's txnmy hs bcm wdly dptd tl n dctn, nflncng nstrctnl dsgn, ssssmnt strtgs, nd lrnng tcms crss vrs dscplns. Dspt ts brd pplctn, th txnmy hs ls fcd crtcsm, prtclrly rgrdng th hrrchcl strctr f cgntv sklls nd ts mplctns fr tchng nd ssssmnt prctcs.