“…The 10 external error modes can be divided into 2 groups: 1 to 6, which are procedural error modes, disrupting the correct sequence of procedural steps; and 7 to 10, which are executional error modes, implying incorrect manipulation of instruments and tissues. [9][10][11]13 Grouping errors in this manner determines the nature of corrective measures: procedural error modes may be reduced by initiating a standardized operative task sequence, while executional error modes may be minimized by practicing surgical skills. …”