Umandlalo wesibhedlele oqhelekileyo yibhedi eneempawu ezikhethekileyo zombini zokuthuthuzela kunye nokuphila kakuhle kwesigulana kunye nokwenza lula kwabakhathaleli.Ziza kwiimodeli ezahlukeneyo kwaye zinokwahlulwa ngokwesiseko zibe ziindidi ezimbini ze-SEMI FOWLER kunye ne-FULL FOWLER ibhedi.Kwibhedi yentaka yentaka, kukho inketho yokunyusa umva usebenzisa isiphatho ukusuka ekupheleni konyawo ngelixa kumandlalo ogcweleyo kukho inketho yokunyusa umva kunye nokunyuswa komlenze usebenzisa iziphatho ezibini ezahlukeneyo.