Nkewa site na njikwa mkpali:
1. Mkpọtụ efu: Mkpọtụ nke sistemụ ahụ anaghịzi enwe mkpali mpụga mgbe mkpali mbụ gasịrị.
2. Mma jijiji a manyere: Mma jijiji nke sistemụ ahụ n'okpuru mkpali nke njikwa mpụga.
3. Mkpọtụ nke onwe: Mkpọtụ nke sistemụ ahụ n'okpuru mkpali nke njikwa ya.
4. Mkpọtụ nke isonye: Mkpọtụ nke mgbanwe nke paramita nke sistemụ ahụ kpaliri.