Igumbi lokuhlola izinga lokushisa eliphezulu neliphansi, elaziwa nangokuthi igumbi lokuhlola imvelo, lifanele imikhiqizo yezimboni, izinga lokushisa eliphezulu, ukuhlolwa kokuthembeka kokushisa okuphansi.Okobunjiniyela be-elekthronikhi nogesi, imoto nesithuthuthu, i-aerospace, imikhumbi nezikhali, amakolishi namanyuvesi, amayunithi ocwaningo lwesayensi neminye imikhiqizo ehlobene, izingxenye nezinto ezisetshenziswayo ekushiseni okuphezulu, izinga lokushisa eliphansi (okushintshana) ukushintsha kwesimo, ukuhlolwa izinkomba zayo zokusebenza zomklamo womkhiqizo, ukuthuthukiswa, ukuhlonza nokuhlola, njengalezi: ukuhlolwa kokuguga.