Cov khoom siv dej tsis muaj dej muaj ntau cov ntawv thov, suav nrog cov hauv qab no:
1. Cov chaw ua si dej hiav txwv thiab dej hiav txwv: Cov chaw no yuav tsum tau tsim cov khoom siv dej tsis zoo thiab cov khoom ua haujlwm tau zoo.
2. Cov khoom siv hauv tsev: qee cov cuab yeej siv hauv tsev, cov cuab yeej siv hluav taws xob, thiab cov khoom siv tshuab hluav taws xob, thiab cov khoom siv tub rog tseem siv cov khoom siv dej tsis huv Connectors.