Ivalve licandelo lolawulo kwinkqubo yokuhanjiswa kolwelo lombhobho.Isetyenziselwa ukutshintsha icandelo lomjelo kunye nolwalathiso lokuhamba okuphakathi.Inemisebenzi yokuguqula, ukunqunyulwa, ukubethelwa, ukutshekisha, ukukhupha okanye ukukhupha uxinzelelo.