Table A20. <D-3-1> Trace ratio of infringement incidents metric.

Item Description
Evaluation item Information security(D) >> Recovery of infringement incident(D.3)
Metric <D-3-1> Trace ratio of infringement incidents
Explanation The success ratio of trace about the origin of the infringement incident
Measurement method X = # o f t r a c e o f inf r i n g e m e n t i n c i d e n t t o t a l # o f inf r i n g e m e n t i n c i d e n t
Y = X T arg e t V a l u e × 100
Data gathering method (Data sources) ■ System ■ Data
□ Questionnaires ■ Interview
※ Measure the occurrence of infringement incident from target IS and the trace information from related reports