Afarta calaamadood ee waaweyn ee "hurdo caafimaad leh" waa: hurdo ku filan, waqti ku filan, tayo wanaagsan, iyo hawlkarnimo sare. Xog la soo ururiyay ayaa muujinaysa in qofka caadiga ahi uu 40 ilaa 60 jeer habeenkii ka soo wareego, qaarkoodna wax badan beddelaan. Haddii ballaca joodariga aanu ku filnayn ama adayggu aanu ahayn ergonomic, way fududahay in la keeno dhaawacyo "jilicsan" inta lagu jiro hurdada.