根本原因
本当
の
原因
。
根本的
な原因。
root cause
Causation
-- how one process influences another
forensic engineering
-- Investigation of failures associated with legal intervention
Proximate and ultimate causation
根本原因分析
、
原因解析
（
RCA
:
root cause analysis
） -- Method of identifying the fundamental causes of faults or
problems
RPR problem diagnosis
Root cause - Wikipedia