■ Naqshadaynta gacan-qabsiga laba-meeloodka ah si loo daboolo baahiyaha tababartayaasha leh ballaca xajinta iyo cududaha kala duwan.
■ xagal baalleyn ah, oo loo qaabeeyey iyadoo maskaxda lagu hayo ergonomics si ay u siiso taageero iyo raaxaysi ugu fiican cagaha isticmaalaha.
■ Dhinaca gudaha ee badeelka ayaa kor u kacaya, isaga oo u adeegaya sifo xaddidan isticmaalaha.
