Lapho uthatha isinqumo sokuthenga ibhayisikili, udinga ukucabangela amapharamitha ambalwa anjengobudala, ubulili, intengo, ikhwalithi, inhloso yokuthenga, uhlobo lwebhayisikili / izici njll. Isibonelo: uma ungumfana oneminyaka engu-24 ubudala, khona-ke ungacabanga ukuthenga ibhayisikili ngobude obungu-18 "intshi, nge-gear & shocker, njll. Futhi uma uyintombazane eneminyaka eyisithupha ubudala, khona-ke ungacabanga ngebhayisikili elungele izingane elinezici ezinhle zokuphepha ingane engakwazi ukugibela.
Isabelomali, izinga nomuntu ozogibela ibhayisikili kuyizinto ezibalulekile. Qala ngokuhlola izinketho ezisekelwe esilinganisweni sesabelomali nohlobo lwebhayisikili ongase uludinge bese unciphisa isisekelo sebhayisikili olifunayo. Bese uqhathanisa izici, intengo nekhwalithi ezingasiza ekunciphiseni inqubo yokukhetha.