Icyerekezo cya MOS: Ibumba ritose ryiteguye gukoreshwa, ryateguriwe gukorerwa ku ruziga, kubumbwa n'intoki no gutera mu bumbano. Buri bwoko bw'ibumba bufite imikorere yabwo, urwego rwabwo rwo gufatirwa n'isura yabwo nyuma yo gufatirwa. Ibumba risanzwe rifatirwa ku bushyuhe buke rikagira ibara rishyushye; ibumba rikomeye rifatirwa hagati cyangwa hejuru rikagira ubukomere; porukorene ifatirwa hejuru cyane ikanyuramo urumuri; raku iteguwe kugira ngo yihanganire guhinduka k'ubushyuhe mu gufatira byihuse.