Ikindi kintu cy'ingenzi cyo kwitaho mu mutekano ni sisitemu yo gufunga feri. Feri nziza ni ingenzi mu kugenzura intebe y'abamugaye, cyane cyane ahantu hateganye cyangwa ahantu hatangana. Ubusanzwe hari ubwoko bubiri bwa feri mu ntebe z'abamugaye: feri zikoreshwa n'umukozi n'izikoreshwa n'umukoresha. Feri zikoreshwa n'umukozi zemerera umurera kugenzura ingendo z'abamugaye, mu gihe feri zikoreshwa n'umukoresha zemerera umuntu uri mu ntebe gucunga umutekano we. Hari amagare amwe agezweho afite sisitemu yo gufunga feri, atanga uburyo bwo kugenzura no koroshya ikoreshwa. Menya neza ko feri zoroshye gufata no kuzikuramo, kandi uzigenzure buri gihe niba zangiritse kugira ngo ukomeze gukora neza.
Ihumure n'ubufasha bifitanye isano rya bugufi n'umutekano, kuko amagare y'abamugaye ashobora gutera imiterere mibi, ibisebe byo mu mutwe, ndetse no kugwa.amagare y'abamugayehamwe n'uburyo bwo kwicara bushobora guhindurwa, harimo uburebure bw'intebe, ubujyakuzimu, n'inguni y'inyuma. Intebe zifite imitako n'inyuma bishobora gutanga ihumure ryinshi no kugabanya ibyago byo kurwara ibisebe. Imitako y'amaboko n'iy'ibirenge na byo bigomba guhindurwa no gushyirwaho kugira ngo bitange inkunga ihagije. Guhagarara neza bishobora kugira ingaruka zikomeye ku mutekano w'umukoresha mu kwemeza ko yicaye neza no kugabanya amahirwe yo kunyerera cyangwa kunyerera kuva ku ntebe.