Ubujyanama "Ibara ni karuvati" birakuze rwose, ibihugu bimwe byateye imbere kwisi mubyukuri, nko mumyaka irenga 30 ishize bifite uburyo bwa siyanse bushobora kugusobanurira neza uburyo bwo guhitamo no guhuza ibara - 1974, the Carroll yo muri Amerika Madamu Jackson yasohoye ibihe bine by'ibara ry'amabara, mu 1983, ms y'Ubwongereza ms Mary, burt, hashingiwe ku bihe bine byambere, Ibihe bine byongerewe ibihe cumi na bibiri ukurikije isano iri hagati y'ibintu bitatu biranga ibara, nkibi nkubukonje, urumuri nubuziranenge, bityo bikemure neza ikibazo cyo kugabanya ibihe byamabara yabantu, bigatuma abantu bakoresha ibara byoroshye, byoroshye kandi binini.Hano mu Buyapani hari abashushanya “ibara rihuza” 400.000;Isosiyete ikora amabara yigihugu nku Bwongereza, Amerika ifite itsinda ryabakozi bashinzwe gushushanya amabara yihariye, stylist yabigize umwuga "collocation" ikora muri buri nganda nko kuzenguruka, kubaka no gutegura ibidukikije, gushushanya imbere, kwamamaza no gushushanya imyenda