The case studies have also shown that the auditors should
be acquainted with the concepts underlying the attributes of PD,
which require background in both lean and human factors. This
required knowledge base is a result of the socio-technical nature
of the poka-yoke design process, which emphasizes the need to
go beyond the traditionally fragmented way that, companies, and
often operations management research, deal with human and technical
issues in the work environment.