Dukas ali ndi akatswiri opanga masewera olimbitsa thupi abwino kwambiri, gulu la ogwira ntchito odziwa ntchito komanso gulu loyang'anira ntchito. Lingaliro lopanga limayang'ana pamagetsi opulumutsa mphamvu ndipo limadzipereka ndikusintha njira kuti mupeze ukadaulo wapamwamba kwambiri wopulumutsa mphamvu pafupipafupi, kukwaniritsa mawonekedwe a mphamvu, kukhazikika.